Utd trail 1-0 from first leg - use play icon to watch 5 Live Final Score
Messi with two goals, second coming from huge De Gea error
VAR had earlier ruled out Barca penalty for Fred challenge on Rakitic
Coutinho with brilliant third, curled into top corner
Ajax win 2-1 at Juve to reach last four and end Ronaldo CL run
Barcelona 0-0 Man Utd (Agg: 1-0)
Robbie Savage
Ex-Leicester City & Wales midfielder on BBC Radio 5 live
Massive opportunity for Marcus Rashford. Those are the opportunities you are going to have to take tonight. He seemed to toe-poke it and Marc-Andre Ter Stegen was beaten but you have to score.
Barcelona 0-0 Man Utd (Agg: 1-0)
Wow, that was something. And here come United again, they play Scott McTominay in on goal again and he just can't gather the ball in!
United could be 2-0 up already! Amazing start.
Victor Lindelof is at right-back, by the way.
#bbcfootball
babyboomer: Ashley Young & Lingard on the same pitch as Messi. Unbelievable. Whatever next?
Mr. E: After last weeks dross there will be goals tonight. Come on MAN U
Noel: If Pogba is as lackadaisical as he was last Saturday, United will get destroyed. McTominay is in to do a lot of the dirty work but if Pogba has any intention of shining, this game has to be it. Still go for an easy home win though
Barcelona 0-0 Man Utd (Agg: 1-0)
What a start!
Manchester United spring Marcus Rashford in behind the Barca defence inside 30 seconds, it's a great run, he's in on goal but shoots against the very top of the bar!
Almost a sensation!
Image source, Getty ImagesBarcelona 0-0 Man Utd (Agg: 1-0)
Under way!
Juventus 0-0 Ajax (Agg: 1-1)
Under way!
Barcelona v Man Utd (Agg: 1-0, 20:00 BST)
Ashley Young leans in for a hug with Lionel Messi as the captains exchange pennants. Get close while you can.
Barcelona v Man Utd (Agg: 1-0, 20:00 BST)
What a noise - 95k inside the Nou Camp. Marvellous stuff...
Image source, ReutersBarcelona v Man Utd (agg: 1-0, 20:00 BST)
Darren Fletcher
Former Man Utd midfielder on BBC Radio 5 live
Man Utd need to accept Barcelona are going to have large spells of possession and they shouldn't lose heart in that. They will get their moments and it's about being clinical with those opportunities. They cannot lose confidence.
Barcelona v Man Utd (Agg: 1-0, 20:00 BST)
Mr Bump Phil Jones is bandaged up as they line up in the tunnel, he took a whack to the head against West Ham of course.
Barcelona v Man Utd (Agg: 1-0, 20:00 BST)
Barcelona have progressed from 39 of their 41 European ties in which they won the first leg away from home – the exceptions were against Cologne in the 1980-81 Uefa Cup, and against Metz in the 1984-85 Cup Winners’ Cup.
2018-19 Manchester United?
Image source, Getty ImagesBarcelona v Man Utd (Agg: 1-0, 20:00 BST)
Almost time to go in Barcelona and in Amsterdam. Who's going through tonight?
Sweet Child O' Mine kicks in at the Nou Camp...
Barcelona v Man Utd (Agg: 1-0, 20:00 BST)
Image source, Getty ImagesOf the 70 previous occasions a side has won a Champions League knockout tie first leg away from home, just four have been eliminated (6%).
However, two of those instances have been in this season’s competition, including once by Manchester United.
#bbcfootball
University Challenge legend crunches the numbers...
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Barcelona v Man Utd (20:00 BST)
Darren Fletcher
Former Man Utd midfielder on BBC Radio 5 live
Ashley Young is a leader and he is a big character. I have been in the dressing room with him and he would be my first choice to wear the armband tonight.
He is probably more suited to be a left-back because he was at his best as a left-winger, but he has never moaned out of position on the right.
Brighton 0-0 Cardiff
We are up and running in tonight's Premier League game - follow that one here.
#bbcfootball
Bradley: Barca are certain to go through. Only reason Man Utd got to the quarters is because PSG always bottle it.
Kyle: It would be some sequence if United win tonight. Losing home games to Barcelona, Juventus and PSG but beating all 3 away from home.
Emyr: I'm sorry but if Ole is playing Jones at right back we will lose by at least 3 tonight... Messi vs Jones is going to get, well... Messi
OGS has set us up for a classic! 3-3 again?
Barcelona v Man Utd (Agg: 1-0, 20:00 BST)
Manchester United
Manchester United manager Ole Gunnar Solskjaer on BT Sport: "We can't wait to get started, it's going to be a great achievement if we get through. We are going to have to ride our luck and work harder than ever. We need more quality than we had last time.
"We will play with no fear, do what we are good at. If this is going to be an open game with many goals we stand a better chance than if it's cagey. We can score many goals. We are confident but humble enough to know it's our hardest night of the season.
"We've got to go for it, we can't sit back and wait for them to make mistakes - they don't make many. We will go at them.
"We played five at the back last time, it was a bit cautious but we tried to stop Messi."
Juventus v Ajax (Agg: 1-1, 20:00 BST)
Image source, Getty ImagesWHAT a player this guy was...
Ajax are looking to reach the semi-finals of the Champions League for the first time since 1996-97 - when they played Juve - while they could become the first Dutch side to do so since PSV in 2004-05.