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22:58 BST - The four Champions League semi-finalists are confirmed. And that's all from us tonight, thanks for joining us!
22:54 BST - Arsenal will face Atletico in the final four after a 1-0 aggregate win over Sporting at the Emirates Stadium.
22:50 BST - Bayern overcame Real Madrid in a seven-goal thriller in Munich to setup a semi-final showdown with PSG.
22:40 BST - The semi-final line-up and dates:
Atletico Madrid v Arsenal (first leg 29 April, second leg 5 May)
Paris St-Germain v Bayern Munich (first leg 28 April, second leg 6 May)
22:35 BST - Arsenal manager Mikel Arteta hailed his team for reaching the last four of the Champions League.
Speaking to TNT Sports, he said: "It's a massive moment. To be part of those four teams (in the semi-finals) is great work. It's a great night. I'm very happy for all our people. We are making steps that haven't been done at this club for 140 years (reaching back-to-back Champions League semi-finals)."
22:05 BST - Arsenal midfielder Declan Rice spoke of his relief after reaching the semi-final of the Champions League.
"Delighted," he told TNT Sports. "So, so happy. It was a really tough test over two games but to go back-to-back semi-finals is an amazing achievement for this group and we now want to go one step further and make the final.
"We've played Atletico Madrid already this season and we know what to expect, so bring on these last couple of weeks."
When asked whether it was a frustrating night, he added: "Frustrating? No, we just got to a semi-final, positivity all the way. Who cares what people think? All that matters is what this group think, what the manager thinks and we're in another semi-final. I'm delighted.
"We'll keep going. Keep playing well. Keep getting over the line and bring it on. Bring on everything.
"Like being at any other top club, there's noise with everything. This is Arsenal football club, there's noise with every game. If you don't play well, if you don't play good, take it with a pinch of salt and keep moving.
"Bring on the last few weeks. It's a rollercoaster. Nobody's going to hand you anything in this game. Let's keep going and what will be will be. Let's keep going strong."
22:00 BST - For the first time in their history Arsenal are in back-to-back Champions League semi-finals.
21:57 BST - Stay with us, reaction to come!
21:56 BST - FULL-TIME! Bayern beat Real Madrid 4-3 on the night and 6-4 on aggregate. Breathless stuff!
READ MORE: Kane stars as Bayern Munich beat Real Madrid in Champions League classic
21:55 BST - GOAL! Michael Olise scores in the fifth minute of injury time and that will surely be that! It's 4-3 and 6-4 on aggregate.
21:52 BST - FULL-TIME! Arsenal hold Sporting 0-0 and go through to the Champions League semi-finals 1-0 on aggregate.
READ MORE: Arsenal grind out goalless draw to reach Champions League semi-finals
21:50 BST - GOAL! Luis Diaz has scored in the final moments to draw Bayern level on the night and ahead on aggregate! It's 3-3, and 5-4 on agg.
21:48 BST - RED CARD! Real Madrid lead 3-2 on the night but they're down to 10 men. Eduardo Camavinga has been shown his second yellow card and is off!
21:48 BST - There will be four minutes of time added on in north London.
21:41 BST - And now it's Arsenal's turn to hit the post! Max Dowman sends in a looping corner to the back post where Leandro Trossard crashes a header against the upright.
21:29 BST - 20 minutes to go at the Emirates and it's still 0-0. It's very nervy with Arsenal leading 1-0 on aggregate.
Over in Germany it's still 4-4 on aggregate with Real Madrid leading Bayern 3-2.
21:20 BST - Madueke goes down clutching his knee and is replaced by Max Dowman. Another injury worry for Arsenal.
21:14 BST - Noni Madueke and Gabriel Martinelli go close for Arsenal as former Sporting star Viktor Gyökeres comes off for Kai Havertz. It's still 0-0 but the Gunners are piling on the pressure.
21:06 BST - Alphonso Davies comes on for the injured Josip Stanisic for Bayern and we're underway in the second half in Munich.
21:02 BST - We're back underway in north London.
20:50 BST - HALF-TIME! It's been a five-goal thriller at the Allianz Arena. Arda Guler is on a hat-trick but the tie is level on aggregate.
20:47 BST - HALF-TIME! Arsenal are fortunate to go in level at the break, with Sporting having the best chance of the match so far through Geny Catamo.
20:44 BST - GOAL! Make that five! Real Madrid lead 3-2 on the night and it's 4-4 on aggregate. Kylian Mbappe gets Madrid's third goal of an astonishing half.
20:44 BST - Sporting hit the post! Geny Catamo lashes a shot from the far post and it clips the other. So close for Sporting to open the scoring at the Emirates. Arsenal have been warned.
20:42 BST - Arda Guler's first goal of the night was the quickest goal Real Madrid have scored in their history.
20:39 BST - GOAL! Goodness me. Four goals in the first 38 minutes and Harry Kane has equalised for Bayern! That's his 50th goal of the campaign. Astonishing.
20:31 BST - GOAL! Real Madrid have re-taken the lead! Arda Guler scores his second of the night from a fantastic free-kick, but should Manuel Neuer have saved it? It's 3-3 on aggregate.
20:15 BST - Arsenal have had a couple of chances at the Emirates but it's still goalless on the night.
20:07 BST - GOAL! Game on Munich! Bayern have equalised inside six minutes through Aleksandar Pavlovic and Bayern lead 3-2 on aggregate.
Bayern have scored 18 first-half goals in 12 games, no team has scored more in the Champions League this season.
20:02 BST - GOAL! Real Madrid have opened the scoring after just 36 seconds in Germany and the tie is level! Manuel Neuer scuffs his clearence to the onrushing Arda Guler who lashes home.
20:00 BST - Referee François Letexier gets us underway in London and moments later Slavko Vinčić does the same in Munich.
19:57 BST - The players are walking on to the pitch and the Champions League anthem is ringing out. We're moments away from kick-off.
19:45 BST - There are 15 minutes until kick-off in tonight's games. Stay with us for all the latest updates.
19:30 BST - Arsenal manager Mikel Arteta has urged his players to "take the opportunity" tonight, and book their place in the semi-finals.
18:51 BST - The team news has dropped and despite missing their open training session yesterday, Declan Rice starts for the Gunners. What a huge boost that could be for them.
Arsenal v Sporting team news
Arsenal boss Mikel Arteta makes four changes to the starting XI that faced Sporting last week. Cristhian Mosquera, Piero Hincapié, Eberechi Eze and Gabriel Martinelli come in for Martin Ødegaard and Riccardo Calafiori who are injured. Leandro Trossard and Benjamin White drop to the bench.
For Sporting, Rui Borges makes two changes to their starting XI. Eduardo Quaresma and Morten Hjulmand come in for Iván Fresneda, who is injured, and João Simões who is on the bench.
Bayern v Real Madrid team news
In the evening's other quarter-final, Bayern's Harry Kane and Real's Jude Bellingham face each other once again.
18:36 BST - Sporting fans are out in force in London as they make their way to the Emirates. We'll bring team news shortly.
17:41 BST - Defeat on Saturday might have dealt a blow to Arsenal's title chances, but tonight the Gunners have the chance to reach back-to-back Champions League semi-finals for the first time in their history. Could this year be their year?
17:20 BST - Arsenal are flying the Premier League flag for English teams left in the competition and have a 1-0 lead from the first leg last week, while Bayern start the evening 2-1 up. Here's a reminder of how those matches played out:
17:11 BST - Following the drama of last night, we now know two of the teams that will make up the semi-finals. The winners of tonight will play:
Atletico Madrid v Arsenal or Sporting (29 April and 5 May)
PSG v Bayern or Real Madrid (28 April and 6 May)
17:00 BST - Hello and welcome along to the second night of Champions League quarter-final action with Arsenal up against Sporting and Bayern facing Real Madrid.
Tuesday 14 April
22:59 BST - That's it from us this evening, thanks for joining us. We'll be back tomorrow for Arsenal's second-leg tie with Sporting, as well as Bayern Munich's big clash with Real Madrid. See you there!
22:54 BST - Fancy reliving tonight's action?
22:51 BST - A picture is worth a thousand words. Here's how much Liverpool threw at PSG in that second half:
22:47 BST - Barcelona boss Hansi Flick says he was really proud of his side's attitude this evening, and has already put the result to bed and set his sights on winning the league.
"We played a fantastic first half. We had to score more goals. It was really possible," he said.
"At the end we conceded the goal. In the end, it’s football. But the attitude, I am really proud of that.
"The next step is to win La Liga. We have to show the attitude, the mentality. We are all disappointed.
"For everyone, it’s a big dream to win the Champions League. Of course we have to learn but we also have a young team. We have to improve and we will improve next season."
22:39 BST - Atletico Madrid are through thanks to the heroics of Ademola Lookman, who scored the winning goal that also stemmed the tide of the Barcelona fightback that was delivered inside 25 minutes.
"Game of two halves, really," he told TNT Sports. "We stuck in and dug in and went through to the semis.
"As the game is going on, you're playing and moments happen in the game. The pause lets you switch back into gear and we were able to create a few chances.
"We got the goal and we were able to continue in that way in the second half."
22:33 BST - Liverpool's Ibrahima Konate was not optimistic when asked about Hugo Ekitike's injury.
"I think it is bad," he told Amazon Prime. "I don't know, I have heard many things, I have no word to talk about that because with the World Cup coming it is very, very hard for him and I send him my prayers."
Asked about his side's performance and what it might mean for the remainder of the campaign, he said: "Many things happened and we don't have to forget that.
"The game today meant a lot of things because against PSG, who are a bit better than last season, to make a performance like that we have to build from that and realise how good we can be.
"It is minimum standard for Liverpool to play Champions League. We have six games left and we have to give all in those six games."
22:16 BST - Can anyone stop PSG from defending their title?
22:02 BST - FULL-TIME: It's all over in Madrid, where Atletico have resisted a Barcelona fightback to book their place in the last four. Barcelona had levelled the tie on aggregate within 25 minutes of tonight's start, but Lookman restored his side's advantage shortly after the half-hour mark. Aside from a goal ruled out by VAR, the Atletico Madrid defence stayed firm for the remaining hour to hold out for victory.
22:00 BST - FULL-TIME: There's the final whistle from the referee which brings down the curtain on Liverpool's Champions League campaign. They fought for the whole game, and looked so close at times to igniting the tie with a goal, but the PSG defence held firm and Dembele made his chances count. In the end, the French giants are the ones to book their place in the semi-finals.
21:55 BST - GOAL! Dembele has another after taking a slick pass from Barcola and that's the tie over.
21:41 BST - RED CARD! Barcelona are down to 10 men after Garcia brings down Sørloth to stop a clear goal-scoring opportunity. The visitors have it all to do in Madrid.
21:36 BST - GOAL! Oh dear, against the run of play, PSG have silenced Anfield. Dembele is the man to shoot from distance and beat the goalkeeper to make it 1-0 on the night and 3-0 on aggregate.
21:33 BST - CLOSE! Mac Allister now flashes a header across goal from a corner. This game has been absolutely enthralling.
21:32 BST - Barcelona mean business - Rashford and Lewandowski have come on in place of Torres and Lopez. Not bad depth to call upon!
21:31 BST - NO PENALTY! It's an unpopular decision at Anfield, but the referee overturns his decision due to a lack of contact in the challenge on Mac Allister.
21:30 BST - The referee has been invited to the monitor to take another look. We know what usually happens here.
21:28 BST - PENALTY! Liverpool have been awarded a penalty! VAR taking a look though...
21:22 BST - Liverpool, meanwhile, have started this second half incredibly well. Anfield is once again bouncing as they move the ball around and pile pressure on the PSG defence. Can they turn that pressure into goals?
21:19 BST - NO GOAL! Barcelona have the ball in the back of the net, but after a long look, it's ruled out by VAR for offside in the build-up.
21:08 BST - We are back underway in both games. Hopefully with more of the excitement we were treated to in the first halves in Liverpool and Madrid.
20:56 BST - Elsewhere, England Women have secured an impressive 1-0 victory over Spain in their World Cup qualifier at Wembley.
20:53 BST - HALF-TIME: There's the referee's whistle at Anfield where things remain goalless, which means PSG still lead 2-0 on aggregate. Liverpool and their fans threw everything at the Parisians in the early stages of that first half, and they will need more of the same in the second if they are to force a result here.
20:49 BST - HALF-TIME: We've reached the break in Madrid, where Barcelona lead 2-1 on the night and trail 3-2 on aggregate. It's been a great game so far, hopefully more of the same in the second half!
20:35 BST - CHANCE! Marquinhos has just shut down a big threat from Van Dijk who was about to pounce on a rebound and fire the ball in. Liverpool could have really lit the touchpaper of this tie if that had gone in. As it was, the defensive effort was immense.
20:33 BST - Oh no. Ekitiké has gone down with a serious looking injury and is pointing at his Achilles. He leaves the field and that unfortunately looks like the kind of injury that will end a season. Here's hoping it's not as bad as that. There was nobody around him, he got caught awkwardly in the turf by the looks of things.
20:31 BST - GOAL! Atletico hit back! It's a slick move as Llorente goes down the right then fires the ball across the defence, and Lookman slots it home. It's 3-2 to the Madrid side on aggregate.
20:24 BST - GOAL! Barcelona are level with Atletico Madrid on aggregate (2-2)! Torres gets a slick pass to break clear and sweep the ball past the flailing goalkeeper. There were not even 25 minutes on the clock when the hosts had their two-goal lead from the first leg decimated.
20:20 BST - CHANCE! Dembele has just flashed at one that he really should have buried into the back of the net. Instead the ball flies over the crossbar.
20:12 BST - There's no question that the two sides who lost in the first leg are throwing everything at their respective opponents in order to overturn those deficits. The atmosphere in Anfield is absolutely bouncing.
20:04 BST - GOAL! Barcelona have scored already! Yamal is the man to do it with barely four minutes on the clock, having taken advantage after Lenglet lost the ball. What have Atletico got here?
20:03 BST - After a moment of silence for the 97 who lost their lives in the Hillsborough disaster, we have kicked off in Liverpool.
20:02 BST - There's already been a save to be made in Madrid, with Yamal slicing through and trying to curl a shot into the left corner. Dangerous signs of the kind of mood they're in!
20:00 BST - And we are off in Madrid! Are there a couple of comebacks on the cards? Stay with us to find out...
19:45 BST - We are just 15 minutes away from our respective kick-offs in Liverpool and Madrid.
19:24 BST - In his programme notes, Liverpool captain Virgil van Dijk says despite the job at hand, this is the kind of occasion "we all live for".
"I couldn't be looking forward to tonight more, and I hope you guys feel the same," he wrote.
"Yes, we know the size and the scale of the task facing us, but these are the games, the nights that we all live for. If you can't get excited for this, then you're in the wrong sport, in my opinion.
"I said after the first leg in Paris that we will need something special if we are to progress to the semi-finals, and that applies first and foremost to our own performance, but also to the atmosphere and the support that you guys will provide. Both will need to be absolutely spot on if we are to have a chance.
"I have been very lucky to experience those nights where the connection between the fans and the performance has been unbelievable.
"I think of Manchester City, Roma, Barcelona of course, even Real Madrid both this season and last, and I can assure you all that everyone in this dressing room believes we can do something again this evening.
"Yes, the performance in Paris was not good enough, and we must improve in every area if we are to have a chance. Anfield, though, is different, and hopefully we can show that tonight."
19:17 BST - One thing is for certain, the atmosphere in Anfield will not disappoint this evening!
19:02 BST - Can Barcelona deliver a big performance this evening and seal a place in the semi-finals once again?
18:49 BST - The team news for tonight's Champions League clashes has arrived! Notably, Mo Salah has been dropped to the bench for Liverpool while Alexander Isak starts. PSG's Bradley Barcola has made the visitors' bench.
18:45 BST - "You never know with Liverpool". Are we in for another historic Champions League comeback under the lights at Anfield this evening?
18:15 BST - Will this affect tonight's visitors?
Earlier today, UEFA rejected Barcelona's complaint over the officiating in their first-leg defeat last week.
Barcelona appealed for a penalty after Atletico goalkeeper Juan Musso appeared to have put the ball back into play from a goal kick before defender Marc Pubill handled it inside the six-yard area to retake it.
Referee Istvan Kovacs waved play on, and the VAR team did not summon him to the monitor.
Barcelona launched an official complaint on Thursday, but UEFA's Control, Ethics and Disciplinary Body deemed the complaint to be inadmissible.
17:38 BST - Here are all the details for the four second-leg fixtures of the Champions League quarter-finals:
17:23 BST - Here's a reminder of how things unfolded in the first legs of these respective ties.
17:11 BST - Good evening and welcome along for our live updates from two huge second-leg ties in the quarter-finals of the Champions League. Liverpool host holders PSG at Anfield looking to overturn a 2-0 deficit from their loss in the first leg in Paris, while Barcelona head to the Spanish capital to take on Atletico Madrid with the exact same remit.
Stay with us as we bring you all the key updates from both games as they happen.