Follow live text updates from the action in the Europa League and Conference League
FT: Europa League: Freiburg 1-0 West Ham - Gregoritsch with late opener
FT: Europa League: Sparta Prague 1-5 Liverpool - Mac Allister from penalty spot before Nunez double
Half-time substitute Bradley scores own goal before Diazand Szoboszlai score
Europa League: Roma 4-0 Brighton - Dybala, Lukaku, Mancini & Cristante on target
FT: Europa Conference League: Ajax 0-0 Aston Villa - Konsa dismissed late on but Gooijer sent off for hosts
Other Europa League ties include Benfica v Rangers (20:00) Qarabag v Bayer Leverkusen (17:45) & AC Milan v Slavia Prague (20:00)
Mohamed Salah (84 mins)
Liverpool legend Mohamed Salah makes it five on his return from injury.
Dominik Szoboszlai finds him on the edge of the box and he curls a shot into the bottom corner. Keeper gets a touch but can't keep it out.
Roma 4-0 Brighton
A chance for Lewis Dunk, at the back of the penalty area, and he has enough space to get a side-footed shot in, but he leans back and sends it over the top.
Ajax 0-0 Aston Villa
Oh it's 10 a side!
Ajax's Tristan Gooijer dives in on Nicolo Zaniolo and gets his second booking of the game.
Ajax 0-0 Aston Villa
Ten-man Villa would definitely take this scoreline back to north Birmingham now.
Roma 4-0 Brighton
Brighton's biggest win of the campaign came last month with a 5-0 victory away at Sheffield United in the Premier League.
The Seagulls may well need something similar next Thursday if they are to stay in European competition.
Twelve minutes left for Brighton to give their fans something to cling on to.
Ajax 0-0 Aston Villa
Jordan Henderson swings in this free-kick, it bounces round for a bit and Brian Brobbey's bicycle kick is off target.
Ajax 0-0 Aston Villa
Villa defender Ezri Konsa is booked for pulling back Chuba Akpom and that's his second yellow card so he's outta here.
Sparta Prague 1-4 Liverpool
Liverpool's first chance in a bit. Dominik Szoboszlai shuffles the ball onto one foot and then the other and has a shot saved.
Ajax 0-0 Aston Villa
Ollie Watkins gets an arm to the face and goes down but he's OK. There's no way Villa could afford for anything to happen to him.
Roma 4-0 Brighton
Brighton look to salvage something from what has been a tough night. Facundo Buonanotte's shot looks to have taken a deflection but goal kick is the verdict.
That's his last action of the night as he is substituted.
Ajax 0-0 Aston Villa
Ajax have a second English player on the pitch as ex-Middlesbrough striker Chuba Akpom comes on for Kristian Hlynsson.
Sparta Prague 1-4 Liverpool
Pat Nevin
Former Chelsea and Scotland winger on BBC Radio 5 Live
The timing could not be any better for Liverpool. Salah looks desperate to get back involved. He knows how to manage his fitness.
Roma 4-0 Brighton
Roma have scored 26 goals in 10 games since Daniele de Rossi took charge - only Liverpool, Manchester City and Arsenal have netted more across all competitions among big-five European league teams since 20 January.
Sparta Prague 1-4 Liverpool
Mohamed Salah makes his return from injury for Liverpool, replacing Luis Diaz.
It's his first appearance since 17 February and only his second for the Reds since New Year's Day.
Ajax 0-0 Aston Villa
Villa sub Nicolo Zaniolo is perhaps harshly booked for an arm into an Ajax player and that means he'll miss the second leg.
Sparta Prague 1-4 Liverpool
Sparta are still going but Andy Robertson deals with a left-wing cross. No chances for a while now.
Ajax 0-0 Aston Villa
Villa youngster Tim Iroegbunam, making only his second start for the club, is replaced, as is Lucas Digne.
Nicolo Zaniolo and Alex Moreno are on.
Bryan Cristante
Brighton are crumbling. Stephan El Shaarawy shows great skill to flick the ball across with the outside of the foot and Bryan Cristante is well clear of marker Igor Julio and his diving header zips past Jason Steele.
Brighton's European campaign is falling apart.
Ajax 0-0 Aston Villa
Couple of corners to Aston Villa. But the move is over as Ezri Konsa is deemed to foul home keeper Diant Ramaj.
Gianluca Mancini
It's getting tougher and tougher for Brighton. A corner from the right is headed away by Jan-Paul van Hecke, but Roma come again.
The cross from deep is met at full stretch by Gianluca Mancini and he prods it past Jason Steele.
There is a VAR check, but Mancini is judged to be onside and it was so close.
Brighton three down.