Liverpool just need to compose themselves for the next few minutes. They're in danger of this tie escaping them before they have even set foot at Anfield.

It's already a huge ask but 3-0 down, Liverpool? Anything can happen...

I feel sorry for people who don't like football. They don't appreciate what Lionel Messi is.

Stacy Phillips: WHAT ARE WE SUPPOSED TO DO AGAINST THAT?!

Rich F: As a Stoke fan, can I just thank Josh (21:32) for the comparison with Barcelona. If I'm honest that Messi free-kick did remind me of Danny Higginbotham in his prime.

Wale Ibraheem: Messi put the game to bed! Is there any footballer dead or alive really better than this guy GOAT?

There's footballers, then there's Lionel Messi.

GOAT.

Image source, BBC Sport

Divock Origi comes on for James Milner. Liverpool are throwing everything at it.

Robbie Savage
Ex-Leicester City & Wales midfielder on BBC Radio 5 live in the Nou Camp

What a chance for Liverpool.

Firmino's shot gets cleared off the line by Rakitic and then Salah has to score. He has to!

But he's hit the post!

This is absolutely bonkers.

Sadio Mane is through but Ivan Rakitic slides in and gets a crucial touch on it. Roberto Firmino picks up the rebound but his shot is saved off the line.

Mo Salah has the goal gaping when it comes back out into the middle again but he slams it against the post!

It just won't go in!!

Robbie Savage
Ex-Leicester City & Wales midfielder on BBC Radio 5 live in the Nou Camp

There are people in front of us standing in disbelief.

Wow. Wow.

That is absolutely incredible from Messi. He has bent it from outside of the post and into the top corner. Allison had no chance.

Amazing goal from Messi.

Image source, Reuters

Fabinho goes into the book for a body check on Lionel Messi. Luis Suarez also gets one for chatting back to the ref.

Jared Maobe: When Van Dijk was expected to stand tall... He's been a pedestrian for both goals Liverpool have conceded.

PG: Van Dijk has had a hand in both goals... lazy defending from the Dutchman twice.

Helles Mahmut: Van Dijk just stopped playing right there... Anyone who thinks he is close to being the world's best defender is delusional...

Liverpool fans are roaring "allez, allez, allez". They know they don't deserve to be 2-0 down and still believe they can get a result here.

An away goal - even if it's just the one - will be very valuable to take back to Anfield.

Peter Collins: Some will say that's a tap in, and a lucky goal for Messi. It is, but he's the only one moving in the box. You make your own luck

Mwatekowa: Where would Barca be without this little magician?? Messi Magic to the rescue for the umpteenth time.

Josh Hammond: Difference between Barca and Liverpool: Barca have taken their chances. Liverpool haven't.

Image source, Reuters

Barcelona have found their stride a little. Lionel Messi causes problems again but he's offside when Andy Robertson gets back to put a decent tackle in.

Now Jurgen Klopp makes the change. Roberto Firmino is on. Off comes Georginio Wijnaldum.

Robbie Savage
Ex-Leicester City & Wales midfielder on BBC Radio 5 live in the Nou Camp

Very fortunate for Barcelona.

Messi got in between the lines and drives at the Liverpool back four. Fabinho makes a great tackle on Messi, it rebounds to Sergi Roberto, bounces off Luis Suarez's knee, off the bar and then straight to Lionel Messi who has the easiest job to score.

So lucky - and against the run of play - but Messi was there to walk it in.

The sting has just been taken out of the game a little bit in the last few minutes. Barcelona have contained Liverpool.

Will Jurgen Klopp make the change and bring Roberto Firmino on?

Image source, Reuters

Raoul van Lennep: Yup Liverpool are having the upper hand this second half but if Barca score that will dampen the mood and absorb the pressure for Liverpool to score.

Gee Em: Barca have been wasting time since the second half started, fake injuries are coming now, along with no balls from the ball boys extra ball on the pitch etc. It'll be a slow last 15 minutes

Jon, Eastleigh: All this praise being heaped on Liverpool here but let's not forget they're currently in the exact same position spurs were in last night when everyone slated them for not being clinical enough. The score is all that matters here

Roberto Firmino is out stretching and warming up...