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FT: AC Milan 0-2 Chelsea - Jorginho penalty after Tomori sent off, Aubameyang gets second
FT: Copenhagen 0-0 Manchester City - Rodri goal ruled out, Mahrez penalty saved, Gomez sent off
Elsewhere, Celtic host RB Leipzig, Real Madrid face Shakhtar and Dortmund welcome Sevilla
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HT: PSG 1-0 Benfica
Each of PSG's last 14 Champions League goals were scored by Kylian Mbappe (nine), Lionel Messi (four) or Neymar (one).
Kylian Mbappe (31) is now PSG's top Champions League scorer, overtaking Edinson Cavani.
FT: Copenhagen 0-0 Man City
Manchester City
Manchester City boss Pep Guardiola speaking to BT Sport: "We start really well against 11. The we had an hour and 10 minutes to hang on. When we had the ball we were clever. It’s a good point.
"Not mathematically [confirmed] but almost qualified for the next round. It’s a good point.
"I didn’t see the actions on TV. We adapted really well. They are too good.
"We are close now. We have to go to Dortmund now and secure the first position."
AC Milan 0-2 Chelsea
Rob Green
Former England goalkeeper on BBC Radio 5 Live
AC Milan put a lot of energy into that opening 15 minutes, going toe-to-toe with Chelsea.
Now, they look like a beaten side.
HT: Borussia Dortmund 1-1 Sevilla
Jude Bellingham is the first English player to score in each of his club's opening four games of a Champions League campaign.
He is the third player to score in four consecutive Champions League matches for Dortmund, after Jan Koller (February to March 2003) and Erling Haaland (October to November 2020).
Oh and also...
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Chelsea will be top of the group as things stand, one point above Salzburg, who are drawing 1-1 with Dinamo Zagreb at half-time.
AC Milan 0-2 Chelsea
Loud jeers from the AC Milan fans in the direction of the referee as he blows for half-time.
Chelsea in control against the 10 men of Milan, who had Fikayo Tomori sent off.
AC Milan 0-2 Chelsea
Matteo Gabbia is a lucky, lucky boy.
Already on a yellow card, he lunges in on Reece James and brings down the Chelsea full-back.
That's the clearest foul of the whole half but this time the referee keeps his cards in his pocket.
Very muddled performance from the man in the middle tonight.
AC Milan 0-2 Chelsea
After a period of Chelsea passing, Mateo Kovacic almost picks out the run of Mason Mount in the box but Pierre Kalulu is across to intercept.
AC Milan 0-2 Chelsea
Another goal for Chelsea will make it a very comfortable teamtalk for Graham Potter at the break.
This will make it three straight wins under the ex-Brighton boss, who is settling in very nicely.
AC Milan 0-2 Chelsea
Five minutes added on in this first half.
AC Milan 0-2 Chelsea
Mason Mount is having a stormer.
The England international turns an AC Milan defender before drilling a low shot from range which is pushed wide by goalkeeper Ciprian Tatarusanu.
AC Milan 0-2 Chelsea
Overcooked by Reece James, sending a cross over the far post.
He had time to pick out a team-mate there.
Image source, ReutersDinamo Zagreb have just made it 1-1 against Salzburg thanks to Robert Ljubicic's heavily deflected strike. That will be good news for Chelsea in their aim to finish top.
AC Milan 0-2 Chelsea
BT Sport
Robbie Savage: "I don't think it was a foul (Tomori on Mount for the penalty).
Ian Darke: "I'll come clean, I think it was."
Thumbs up for penalty.
Thumbs down for wrong decision.
AC Milan 0-2 Chelsea
Pierre-Emerick Aubameyang has scored in consecutive Champions League appearances for the first time since December 2017 (for Borussia Dortmund).
He has been directly involved in 15 goals (13 goals, 2 assists) in his last 19 games in the competition.
AC Milan 0-2 Chelsea
AC Milan are looking to get back into this contest but Olivier Giroud heads over from a corner.
How costly that earlier miss has proven to be.
Kylian Mbappe, who reportedly wants out at PSG, gives them a 1-0 lead over Benfica from the penalty spot.
That's a big game in the battle for top spot.
AC Milan 0-2 Chelsea
Rob Green
Former England goalkeeper on BBC Radio 5 Live
It's a fantastic one-touch finish.
Pierre-Emerick Aubameyang has barely had a touch in the game but it's wonderful one-touch football to cut apart Milan.
Milan are trying to apply pressure but it's leaving spaces all over the pitch. It's a clever lay off by Mason Mount. I think it was meant for Raheem Sterling but Aubameyang pounced.
He slams it in the corner and Chelsea are in complete control.
AC Milan 0-2 Chelsea
A change for AC Milan in a disastrous first half.
USA international Sergino Dest is on for ex-Manchester City forward Brahim Diaz.
AC Milan 0-2 Chelsea
Now Rade Krunic is yellow carded by Daniel Siebert.
The referee is going to need a bigger book at this rate.
He has shown five yellow cards and one red so far.