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19:10 GMT - Celtic have been on top in the second half against Feyenoord, and are currently enjoying 75% possession.
Villa are in total control at home to Young Boys.
19:03 GMT - Donyell Malen has the ball in the net for the third time for Villa, but the goal is ruled out for offside.
Malen just needs one more goal to score the most goals by any Aston Villa player in a single edition of the Europa League, overtaking John Carew in 2009 (two goals).
18:56 GMT - We're back underway at Villa Park after the lengthy delay to the first half.
18:55 GMT - Team news has dropped for the later kick-off:
18:48 GMT - We're back underway at Feyenoord.
18:40 GMT - HALF-TIME! Aston Villa 2-0 Young Boys
18:34 GMT - Police are escorting away supporters from Villa Park as the referee consults both managers and the fourth official. Chairs, bottles and goodness knows what else is being thrown. There will be a long delay to the half here.
18:33 GMT - HALF-TIME! Feyenoord 1-2 Celtic
18:30 GMT - GOAL! Aston Villa 2-0 Young Boys: Villa pile forward and Morgan Rogers squares to Donyell Malen who lashes home his second goal of the night.
Young Boys supporters explode. Fights break out and police swarm the area. It's turned ugly and Young Boys players appeal for calm.
18:29 GMT - GOAL! Feyenoord 1-2 Celtic: The Hoops have turned it around! Daizen Maeda chases down goalkeeper Timon Wellenreuther who can only find Reo Hatate who lashes the ball into the net.
18:17 GMT - GOAL! Feyenoord 1-1 Celtic: Yang Hyun-Jun thumps the ball into the net giving Timon Wellenreuther no chance! Celtic are level.
18:15 GMT - GOAL! Aston Villa 1-0 Young Boys: It has been coming and finally Donyell Malen heads the Villans into the lead.
Villa celebrate in front of the Young Boys supporters as missiles come pouring down. Malen is struck on the head, drawing blood.
18:03 GMT - Youri Tielemans is pelted with objects thrown by Young Boys supporters as he tries to take a corner. I'm sure we haven't heard the last of that...
17:57 GMT - GOAL! Feyenoord 1-0 Celtic: The ball is lofted to captain Sem Steijn who squares to Ayase Ueda who thumps home to give the Dutch side the lead after 11 minutes.
17:48 GMT - And we're off after a slightly delayed start at Villa Park.
17:38 GMT - Celtic interim manager Martin O'Neill has spoken to TNT Sports ahead of what could be his final match in charge, with Wilfried Nancy set to be their next permanent manager.
"The performance (tonight) is almost secondary to the result, but we'd like to play well obviously. Tonight is about trying to get on the front foot and just go and attack.
"I would like to stay in the competition if we can."
17:35 GMT - We have 10 minutes to go until the first matches of the night get underway. Stay with us for all the updates!
17:02 GMT - It's been a season of relative calm for Feyenoord after a rocky start to the year.
The club is currently managed by former Arsenal and Man Utd striker Robin van Persie, who replaced interim manager Pascal Bosschaart in February. Bosschaart took over from Brian Priske, who was appointed Arne Slot's replacement last summer, but only managed a few months in the role before he was sacked.
16:35 GMT - The team news has dropped for the early kick-offs.
Aston Villa: Emiliano Martínez, Ian Maatsen, Pau Torres, Victor Lindelöf, Lamare Bogarde, Youri Tielemans, Amadou Onana, Jadon Sancho, Morgan Rogers, Evann Guessand, Donyell Malen
Young Boys: Marvin Keller, Loris Benito, Sandro Lauper, Tanguy Zoukrou, Jaouen Hadjam, Dominik Pech, Rayan Raveloson, Saidy Janko, Christian Fassnacht, Darian Males, Sergio Córdova
Feyenoord: Timon Wellenreuther, Gijs Smal, Tsuyoshi Watanabe, Anel Ahmedhodzic, Jordan Lotomba, Oussama Targhalline, Sem Steijn, Luciano Valente, Leo Sauer, Ayase Ueda, Anis Hadj Moussa
Celtic: Kasper Schmeichel, Kieran Tierney, Liam Scales, Auston Trusty, Colby Donovan, Luke McCowan, Callum McGregor, Reo Hatate, Arne Engels, Daizen Maeda, Yang Hyun-Jun
16:30 GMT - Looking ahead to the first two fixtures, here's a bit of background the last time they met.
Aston Villa won the last meeting against Young Boys, emerging victorious 3-0 in a Champions League league phase match at Stadion Wankdorf last season. Youri Tielemans struck first for the Villans side in the 27th minute. Jacob Ramsey and Amadou Onana also were on target.
Celtic won the last meeting against Feyenoord, coming out on top 2-1 in a Champions League group stage match at Celtic Park in December 2023. Luis Palma scored first for the Hoops in the 33rd minute from the penalty spot. Gustaf Lagerbielke also was on target. Yankuba Minteh scored the Stadionclub's only goal in the 82nd minute.
16:00 GMT - Hello and welcome along to the live blog for the Europa League and UEFA Conference League!
We're heading for the now-or-never / make-or-break / do-or-die period of the group stages as we tip over the halfway point in the Europa League and approach that stage in the Conference League.
Will Rangers climb off the bottom of the table? Can Villa cement their place in the top eight? And what about Crystal Palace and Nottingham Forest's chances?
Kick-off times vary around Europe tonight, with Aston Villa and Celtic getting us underway in over an hour's time.
Stay with us for all the updates throughout the night.
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