Villa were once 2-0 up this tie. They've got just over 20 minutes to save it.

Ian Kennedy
Reporter, BBC Radio Merseyside Sport

Liverpool have produced many amazing European comebacks down the years, but if they pull this one against Atalanta out of the bag, it would be right up there with the best of them.

The memorable ones - St Etienne, Auxerre, Dortmund and Barcelona - all came at Anfield. It will be a big ask away in Italy but, despite the performance against Crystal Palace, do not be surprised if it is closer than you think.

Are Liverpool capable of being 2-0 up at half-time? Absolutely! Then it is game on again.

It was such a shock to see how Liverpool played in their past two games, you can only imagine a much improved performance, which of course it will have to be.

As for the Premier League title, it felt like a devastating blow on Sunday, but with Arsenal also losing, it is still there to battle for. Manchester City are favourites now but it is only two points. There are 18 points still to play for, but you feel there can't be any more slip-ups.

Fulham away is next on Sunday. No Premier League game away from home is easy, and whatever happens in Italy, Liverpool will have to be back to their best at Craven Cottage.

Image source, Getty Images

I'm going to level with you guys, so far, it's not been a great half of football. Tense is the word. Very, very tense.

Lucas Digne becomes the fifth player in this match to get a yellow, after he takes out Tiago Santos on the sideline.

Lille are having a good period. They're passing it nicely just outside the Villa box.

Simon Stone
BBC Sport at the London Stadium

Image source, Getty Images

West Ham have twice come back from two goals down following the away leg of a European tie and got through.

The first occasion was against Dutch side Den Haag in the last eight of the European Cup Winners' Cup in 1976, when West Ham went through on away goals.

The second was against Spanish outfit Castilla, also in the European Cup Winners' Cup in 1980.

I would argue tonight's task is harder.

Leverkusen have not lost a game this season. They are the new German champions and they reached the semi-finals of this tournament last term.

Here come Lille. Tiago Santos gets away from Lucas Digne but the Villa left-back recovers to cut out Santos' cross.

Lille win a corner but goalscorer Yusuf Yazici hooks it straight out of play.

Lucy Ward
Former Leeds striker on TNT Sports

Image source, Reuters

There is good energy from this Lille team. Can they keep it up the full 90-minutes?

Much, much better from Aston Villa as Matty Cash plays a one-two with John McGinn before smashing a shot into the side-netting.

West Ham have made three changes to the side who were beaten 2-0 in Germany in the first leg.

Lucas Paqueta misses out through suspension but Jarrod Bowen is back from injury.

Konstantinos Mavropanos and Emerson miss out as Nayef Aguerd and Edson Alvarez come in.

West Ham starting XI: Fabianski, Aguerd, Zouma, Cresswell, Coufal, Soucek, Ward-Prowse, Alvarez, Kudus, Bowen, Antonio.

Subs: Anang, Knightbridge, Ogbonna, Ings, Johnson, Cornet, Mubama, Orford, Casey, Swyer.

Image source, BBC Sport

Newly-crowned Bundesliga champions Bayer Leverkusen have made three changes to the side who beat West Ham 2-0 last week.

Edmond Tapsoba, Jeremie Frimpong and Amine Adli miss out for Piero Hincapie, Odilon Kossounou and Nathan Tella.

Bayer Leverkusen starting XI: Kovar, Stanisic, Tah, Hincapie, Kossounou, Palacios, Xhaka, Grimaldo, Wirtz, Tella, Schick.

Subs: Hradecky, Lomb-Hofmann, Andrich, Tapsoba, Arthur, Adli, Boniface, Frimpong, Puerta, Izekor.

Image source, BBC Sport

Liverpool boss Jurgen Klopp was asked about what he said to his team before their comeback from 3-0 down to beat Barcelona in 2019 and what he might say today

"I remember that I said, 'if we fail, let's do it in the most beautiful way' - and that's exactly how I see it again," he said.

"We want to win the game but if we want to win then we'd better play good. If you play good then we have a chance to win it. We will see.

"I cannot win the game in this press conference. That's why I'm not really interested in the questions you are asking and what I'm answering as well. When I leave this room, finally, that is when it starts."

Atalanta make two changes from last week's first leg at Anfield.

Former Arsenal defender Sead Kolasinac and Aleksei Miranchuk come in for Mario Pasalic and Charles De Ketelaere.

Ex-West Ham striker Gianluca Scamacca, former Middlesbrough midfielder Marten de Roon and ex-Chelsea wing-back Davide Zappacosta all start.

Atalanta XI: Musso, Gjimshiti, Hien, Kolasinac, Zappacosta, De Roon, Ederson, Ruggeri, Koopmeiners, Al. Miranchuk, Scamacca.

Subs: Carnesecchi, Rossi, Toloi, Holm, Pasalic, Toure, Lookman, De Ketelaere, Bakker, Adopo, Hateboer, Bonfanti.

Image source, BBC Sport

It is all change for Liverpool, with Jurgen Klopp opting to make six switches from the first leg.

Alisson starts in goal, while first-choice full-backs Trent Alexander-Arnold and Andy Robertson are both back.

Dominik Szoboszlai gets the nod over Endo in midfield, meaning Aleix Mac Allister will sit deeper.

Mohamed Salah and Luiz Diaz join Cody Gakpo in the forward line.

Liverpool XI: Alisson, Alexander-Arnold, Konatae, Van Dijk, Robertson, Mac Allister, Szoboszlai, Jones, Salah, Gakpo, Diaz.

Subs: Adrian, Kelleher, Gomez, Endo, Nunez, Elliott, Jota, Tsimikas, Gravenberch, Clark, Danns, Quansah.

Image source, BBC Sport

Image source, Getty Images

Lille look to break forward through Jonathan David but Villa defender Pau Torres does brilliantly to sweep the ball up before dribbling out of a hole.

Some better football from Villa who patiently build up from the back.

Lucas Digne's eventual cross into the area though is caught by Lille keeper Lucas Chevalier.

It's becoming scrappy in midfield. John McGinn tries to start an attack but his pass forward is intercepted.

Simon Stone
BBC Sport at the London Stadium

Image source, Getty Images

Today feels like a key day for West Ham.

Victory and progression from their two-legged Europa League quarter-final against Bayer Leverkusen - the unbeaten, newly crowned German champions - would go down as one of the greatest nights in the club's history.

It is a long shot.

More likely is elimination and an end to three years of European adventures, which brought many memorable stops, capped by that glorious night in Prague.

What would be left is a seven-match run to the end of the Premier League season, with the Hammers knowing if Chelsea or Coventry City win the FA Cup, they would have to finish sixth to secure a European place next season.

Given the run-in includes trips to Chelsea and Manchester City, plus a home game against Liverpool, it feels like a tough ask.

And that will turn the focus back on manager David Moyes and his future.

Some fans wanted the Scot out after the Europa Conference League triumph, since when attitudes among the 'Moyes Out' brigade have hardened.

Is Moyes up for the challenge of continuing? Would co-owner David Sullivan want him to? These questions have to be asked at some point.

West Ham can only hope that day is not about to arrive.

Aston Villa were so sloppy in the first half but I always felt, if they got to half-time level, they'd manage to work things out at the break and pull away in the second period.

So far, they're looking just as poor as they did in the first 45 minutes. This isn't great from the English club.

Lucy Ward
Former Leeds striker on TNT Sports

Image source, Getty Images

A couple of passes which were sloppy and you cannot give that opening too many times in Europe - a let off for Aston Villa.