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18:05 GMT - There have been plenty of classics between Chelsea and Barcelona in Europe over the years, no less than that 2009 semi-final at Stamford Bridge, which provoked outrage amongst the home support but was most memorable for the Iniestazo that took the Catalans to Rome.
It might be a surprise to note that Barcelona have actually only won one of the last nine games against Chelsea, so they might find they're up against it again versus the team that is second in the Premier League table.
Read more: Barcelona looking to stop poor record against Chelsea in Champions League
17:32 GMT - Manchester City's defeat to Newcastle on Saturday left them seven points behind leaders Arsenal in the Premier League, but they will have an immediate chance to shrug off any hangover as they take on Leverkusen in what will be Guardiola's 100th Champions League game as City manager.
On yet another milestone, shortly after reaching 1,000 games as a manager, Guardiola told reporters on Monday: "I realise I'm getting old. It's good. It means every season we've been there.
"It's a huge competition. It's special for the players. To challenge yourself with the best teams in Europe is incredible, a huge experience. For the club, in terms of reputation, prestige and financial issues, it's massively important."
Read more: Man City manager Guardiola apologises for confrontation with cameraman
17:27 GMT - Newcastle meet Marseille at the Orange Velodrome on Tuesday in what is the first ever meeting between the two sides.
In his press conference on Monday, Howe was asked about consistency and how the Magpies must keep their form up heading into the clash against the French side.
"We just want to win the game," Howe said.
"In terms of qualification and being able to rotate the team later in the tournament, of course, if we are in a position where we are able to do that, then great, but at the moment we are still in the thick of the Champions League."
Read more: Howe admits Newcastle seek consistency as they face De Zerbi's Marseille
17:17 GMT - Arguably the standout fixture of the night, Chelsea welcome Spanish giants Barcelona to Stamford Bridge for a good old knees up.
One player who won't be featuring for the Blues is Cole Palmer, who is said to be close to a return but not quite ready yet.
"Cole is wearing a (protective) boot," Maresca told reporters on Monday.
"We don't know when he will be back, but for sure it will be soon. He's already on the pitch, he's already touching the ball and the feeling (for him) is good.
"I don't think he will be available for these two games (Barca and Arsenal), but he is doing well."
Read more: Maresca insists Chelsea are ready for crucial fixtures ahead of Barcelona clash
17:00 GMT - Welcome back to Flashscore's Football Tracker!
With no more international breaks until next year, we're nearing crunch time in Europe's elite competition.
Three Premier League sides are in action tonight, with Chelsea hosting old foes Barcelona, Manchester City welcoming Bayer Leverkusen to the Etihad, and Newcastle heading across the channel to face Roberto De Zerbi's Marseille - each of those games kicks off at 20:00 GMT.
