Callum Hudson-Odoi has a shot blocked and Jan Oblak saves.

All three days of Champions League action this year have seen five-goal games - Barcelona 1-4 Paris St-Germain and Sevilla 2-3 Borussia Dortmund are the others.

Rob Green
Former England goalkeeper on BBC Radio 5 Live

Olivier Giroud is up there on his own against three centre-halves and it's asking so much of him to even create something and get a glimpse of the ball. I think it's better when Mason Mount gets involved. He can create the angles and opportunities in and around the defensive three.

Brilliant from Mason Mount. He hurdles two challenges in midfield and plays an excellent ball down the left wing to Timo Werner. Sadly for Chelsea, Werner's cross is cut out.

Chelsea have been bright in this half with Mason Mount having a shot blocked and Callum Hudson-Odoi involved. Every time I tried to tell you about something there was a goal in the other game.

Chelsea get a bit lucky. A free-kick comes in and Cesar Azpilicueta heads the ball back to his keeper. Well he thinks Edouard Mendy is there but he isn't and Luis Suarez can't take advantage but it's a corner.

Ted Clarke: Never mind a bus, it feels like Atletico have parked a couple of supertankers across their half of the pitch in the first half. Chelsea doing most of the passing and shots. If the defence doesn’t crumble, they might just take it to Atletico in the second half!

Roger: Chelsea's team selection seems all wrong. Pick one of the best international centre forwards and then never cross a ball to him.

The second halves begin.

Bayern have scored 10 goals in their last 135 minutes at the Stadio Olimpico, after winning 7-1 against Roma on 21 October 2014.

The last time a team had a half-time lead of at least three goals in a Champions League knockout match was Bayern's 8-2 win over Barcelona last season (4-1 at half-time).

Atletico Madrid had just one shot in the first half, their lowest total after 45 minutes in a Champions League match since the 2016-17 semi-final first leg against Real Madrid.

Chelsea attempted 403 passes in the first half, over 100 more than any of Atleti's opponents in the first half of a Champions League game this season.

Leon Osman
Former Everton midfielder on BBC Radio 5 Live

I do feel Chelsea have had a good bit of control in the game. We saw at the end when Mason Mount and Callum Hudson-Odoi injected a bit of tempo and speed into their passing and running, they nearly opened up that back six of Atletico Madrid.

I think both managers will be pleased with how the first half has gone without over-extending themselves.

John Livinus: Mount inexperience, Giroud struggling, Odoi and Alonso decent, Chelsea need to be more creative and remain discipline second half.

Rob Green
Former England goalkeeper on BBC Radio 5 Live

I think Thomas Tuchel will be pleased, Chelsea have had control. I think they have played themselves into a bit of bother a couple of times, over-playing at the back - but that's the risk they are willing to take.

However, it's been solely dictated by the way Atletico Madrid have set up. They are so deep, so negative. But Chelsea would've taken this scoreline at the start of the half.

We reach the break in Rome too. Bayern Munich are in complete control. Joshua Kimmich almost made it 4-0 just before the whistle.

The half-time whistle goes. Not a classic.

Mason Mount whips in the corner but Cesar Azpilicueta fouls Koke. Free out.

Chelsea win a corner towards the end of the first half. Mason Mount has been involved in most of their attacks.