Messi slots in from tight angle before Dembele scores first Barca goal
Messi nets 100th CL goal to seal 4-1 aggregate win for Spanish side
Bayern beat Besiktas 3-1 in Turkey (8-1 on aggregate)
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Barcelona 1-0 Chelsea (agg: 2-1)
Having fallen behind, Chelsea respond well and gain a free-kick down the left.
Willian whips it in, low towards the front post, and it almost sneaks in via a deflection, but hits the sidenetting.
Barcelona 1-0 Chelsea (agg: 2-1)
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
Antonio Conte said 'we have to suffer' and Chelsea are suffering. It's the worst possible start. They sat in and said 'you're going to have to play through us' and Barcelona have got through.
Lionel Messi somehow found a way past Thibaut Courtois at his near post. It is dreadful goalkeeping, he had no right to score from there. He goes down too slowly.
Image source, Reuters
Lionel Messi
Image source, Rex FeaturesObviously him.
This is a terrible goal to concede and so early in the match.
Lionel Messi tries a one-two with Ousmane Dembele but Marcos Alonso fails to clear the ball from inside his own box.
It drops back to the Argentine - you don't want that - and he slips a right-footed finish in between the legs of Thibaut Courtois and into the net.
It was a very weak shot. Often so reliable, this is a moment goalkeeper Courtois will want to forget.
Image source, Getty ImagesBarcelona 0-0 Chelsea (agg:1-1)
It was a full 90 seconds before Chelsea got their first touch on the ball with an interception on Ousmane Dembele.
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Reeza S: Set pieces will be key for Chelsea tonight. Olivier Giroud to be the match winner!
Max: We've done this before, just keep concentration levels high and hit them on the counter.
Bayo O: The Camp Nou is something else. The atmosphere is unbelievable. And the noise? I’m worried sick.
Barcelona 0-0 Chelsea (agg:1-1)
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
I think Andres Iniesta being fit is a real boost for Barcelona. He's a fantastic player that Antonio Conte called a genius.
Image source, Getty ImagesBarcelona 0-0 Chelsea (agg:1-1)
One minute gone and Barcelona have had 100% possession so far.
Don't expect that to change too much.
Barcelona 0-0 Chelsea (agg:1-1)
Will it be Barcelona or Chelsea that clinches the remaining place in the Champions League quarter-finals?
The Nou Camp is looking resplendent.
We are under way.
Barcelona v Chelsea (19:45 GMT)
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
This is the sort of stage you want to play on as a player. I was unbeaten here on two occasions as a Celtic player. We had about 4% possession in those games mind.
This is a real opportunity for Chelsea and their big players to make a name for themselves. When you come out of the tunnel you are just concentrating on your job.
Barcelona v Chelsea (19:45 GMT)
Here come the players into a cacophony of noise.
What a stadium this is.
It makes the hairs on the back of your neck stand up when the Champions League anthem belts out over the speakers.
Image source, AFP/Getty ImagesBarcelona v Chelsea (19:45 GMT)
Barcelona are unbeaten during their last 24 home Champions League matches (won 22, drawn two).
On the other hand, Chelsea are unbeaten in their last eight meetings against Barca (won two, drawn six).
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Scarlet: Three things are certain in life: death, taxes and the fact that Chelsea will be shown a red card tonight.
Science Student: Antonio Conte is a listener, not a cocky Jose Mourinho. No more false 9. Hazard now a happy man. Let the game begin!
Paul A: Trying to think of the last decent contribution Cesc Fabregas made for Chelsea. I can't and that just about sums it up.
Image source, Getty ImagesBarcelona v Chelsea (19:45 GMT)
Charlie Adam
Stoke City midfielder on BBC Radio 5 live
I think Eden Hazard is someone that Real Madrid will come for in the summer.
He doesn't have to necessarily play well in the World Cup. Real Madrid have to try and catch Barcelona and he is the sort of player they will be looking at.
Image source, Getty ImagesBarcelona v Chelsea (19:45 GMT)
Image source, PA"Close him down," will be Barca boss Ernesto Valverde's instructions to his players when Willian has the ball at his feet.
Six of the Brazilian's nine Champions League goals for Chelsea have been from outside the box.
Since he joined the Blues in 2013, he has scored more from long range than any other player in the competition.
His opener in the first leg was delightful.
Barcelona v Chelsea (19:45 GMT)
Chelsea
Chelsea manager Antonio Conte tells BT Sport: "I think Olivier Giroud played a really good game with Eden Hazard and Willian and we want to try to do the same today. We have to play against a strong team and we must be ready with these players to work very hard, especially Eden and Willian. We have spoken about this decision and this is the best thing to do.
"In Giroud, are talking about an international player with great experience. That will be positive for us because we a re a young team facing a great team.
"When you play a very strong team like Barcelona, they like to dominate possession. You must be very good to keep calm and suffer. Usually, they have a lot of possession and the players do not like only to run, they like to have the ball."
Barcelona v Chelsea (19:45 GMT)
Barcelona forward Luis Suarez has failed to score in the last 881 minutes of play in the Champions League, his longest drought in the competition.
His last goal came back in March 2017 against Paris St-Germain.
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Jon C: Big performance needed by Chelsea. A Barca goal doesn’t change much - so no reason to be timid. Work your socks off, and take your chances when they come. We’ve done this before!
James: I'm very happy indeed with Chelsea's lineup tonight. Antonio Rudiger over Gary Cahill, Victor Moses over Davide Zappacosta, Cesc Fabregas over Tiemoue Bakayoko, a striker over a false 9. Inspired.
Barcelona v Chelsea (19:45 GMT)
Andy West
Spanish football writer at Nou Camp
Image source, Getty ImagesErnesto Valverde is a pragmatic manager, Barcelona are disciplined and difficult to beat. They have not lost a league game all season.
In the last 18 months under Luis Enrique they were accused of being two teams within a team, the front three and then the rest of the team with no real midfield.
Neymar has left as well but it has made them a more coherent team. They are just a bit more disciplined all the way round.
Barcelona v Chelsea (19:45 GMT)
The players are out on the magnificent Nou Camp pitch going through their 'rondo' warm-ups.
Chelsea striker Olivier Giroud is the 'piggy in the middle', chasing after the ball as his team-mates pop it around him.
He is going to have an awful lot of chasing to do once the match starts. A big night for the Frenchman.
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Image source, AFP/Getty ImagesHamza: If Eden Hazard can deliver here then Real pick him up. If Olivier Giroud delivers here Arsenal sack Arsene Wenger.
Charbel: Finally, we are putting out a strong team against Barcelona, All you Barcelona fans better watch out because there is a Hazardous player coming your way! Eden is on fire! Prediction: 0-1 Chelsea COYB
Mr I: No matter what outcome, as a Chelsea fan I'm going to try and enjoy this game. If we lose today, then finish outside top four, lose Antonio Conte, Eden Hazard & Thibaut Courtois in summer - we are going to be out of Europe for a long long time!