Good from Chelsea. Mason Mount evades Alphonso Davies but then he drags a shot wide of the near post. Olivier Giroud, who had set up the move with a flick-on, was looking for a return ball.

No chances yet at San Paolo. Barca have had 89.1% of the ball.

Chris Sutton
Former Chelsea striker on BBC Radio 5 Live

It just didn't sit right for Mason Mount. It was a tremendous throw from Cesar Azpilicueta. Mount was just off balance and it's gone high, high up into the stand.

Image source, Reuters

Chelsea's first attack. A long throw-in from Cesar Azpilicueta causes some problems and Champions League anthem-loving legend Mason Mount volleys over from 20 yards.

Image source, Reuters

Free-kick to Chelsea on the halfway line as Jerome Boateng shoves Olivier Giroud. But the Blues do not turn it into an attack.

Chris Sutton
Former Chelsea striker on BBC Radio 5 Live

Mason Mount has just fouled Alphonso Davies

It was a strong challenge. Mason Mount might be a bit lucky to get away with that. He does get the ball but it is studs up.

This is Lionel Messi's 141st game in the Champions League, taking him joint-fifth - alongside Ryan Giggs - on the all-time list.

He can score a Champions League goal in a 16th calendar year. Only Raul (17) and Giggs (16) have scored in more than 15.

Under way in Naples too.

This is Willy Caballero's first Champions League game in almost three years. His last was for Manchester City in a 3-1 defeat by Monaco in March 2017.

It's Olivier Giroud's first Champions League start since March 2018 against Barcelona. He has scored 11 goals in his previous 22 Champions League starts.

Chris Sutton
Former Chelsea striker on BBC Radio 5 Live

It's a save you would expect Willy Caballero to make. That's a sign of what you get from Bayern Munich though.

It's taken 40 seconds for Bayern Munich's first chance. Thomas Muller snatches at a shot just outside the box and Willy Caballero saves.

Under way in London.

Chris Sutton
Former Chelsea striker on BBC Radio 5 Live

Chelsea have to defend really strongly, they're going to have to weather a storm from time-to-time. I think Bayern are that good. But Chelsea have got to get up the pitch and create chances and more importantly take them. Frank has spoke about how disappointed he's been at times with his team in both final thirds. Against a side of this magnitude they can't afford to do that.

Phil McNulty
BBC Sport chief football writer at Stamford Bridge

Chelsea's fans loudly registering their disapproval of VAR - and we haven't even kicked off yet.

It is easy to sympathise with them as Chelsea have been on the receiving end of three poor VAR adjudications in the last week, firstly when Harry Maguire escaped a red card and Kurt Zouma had a goals wrongly ruled out against Manchester United.

And of course on Saturday when Tottenham's Giovani Lo Celso escaped a red card for a dreadful tackle on Azpilicueta, which VAR officials at Stockley Park then admitted was the wrong decision.

Delighted to see a player take the Champions League tune seriously.

Chelsea's Mason Mount said: "When you hear the Champions League anthem you kind of pinch yourself. I remember speaking to Tammy Abraham about it and saying when the song is on it’s just an unreal feeling.

"It’s kind of overwhelming to be involved and to hear that song that many legends in the past have been able to stand there and listen to. It’s obviously a massive moment."

He was only 13 when Chelsea beat Bayern in the 2012 Champions League final.

"I was at home, with my family, we were all watching it. I remember it very clearly. We were all jumping around in the front room celebrating.

"It’s quite surreal, how in the past it’s happened and now we’re playing against Bayern and a legend’s the manager."

Image source, Getty Images

Five minutes to go. Players in the tunnel. Almost anthem time. Excited?

Robert Lewandowski has scored in all of his five Champions League appearances this season (10 goals in those five games).

No Bayern player has ever scored in six consecutive Champions League matches.

Chris Sutton
Former Chelsea striker on BBC Radio 5 Live

Olivier Giroud is key in terms of them getting up the pitch, but you look at the back three. They are going to be tested. Bayern have such good attacking players and Robert Lewandowski is the most in-form striker in football.

Tonight is actually the Champions League debut of Barcelona boss Quique Setien, who has never played or managed in the tournament before.

The 61-year-old has managed Racing Santander, Poli Ejido, Equatorial Guinea, Logrones, Lugo, Las Palmas and Real Betis before replacing Ernesto Valverde last month.

His opposite number is also managing a Champions League game for the first time - but Gennaro Gattuso won it twice as a player.

Image source, Getty Images