Let's have a look at the scores around Europe:

• Galatasaray 1-1 Barcelona
• Inter Milan 1-1 Club Brugge
• RB Leipzig 0-0 PSV
• Viking 2-0 Bayern Munich
• Villarreal 2-1 Napoli

The whistle goes for half time and Atletico have the lead, but Manchester United are still in this.

Elizabeth Conway
BBC Sport Spanish football reporter at Metropolitano Stadium

That decision is a massive let off for United, especially just before half-time.

The goal is chalked off, Marcos Llorente is deemed to have handled the ball when he got into the box as part of the build up to the goal.

Atletico's lead remains 1-0.

All square at the break. Not loads to write home about either.

Video Assistant Refereepublished at 20:47 BST

20:47 BST

Atletico Madrid 2-0 Manchester United

The referee goes to the screen for a look...

Image source, Getty Images

Elizabeth Conway
BBC Sport Spanish football reporter at Metropolitano Stadium

Bruno Fernandes is absolutely furious with the referee. The United players are surrounding the ref, saying there was a handball in the build-up.

The ref is going to have a look.

It's virtually impossible to stop this Barcelona side from scoring and they've done just that to stun the home crowd just before the break.

Lamine Yamal is tackled in the D and the ball breaks kindly for Joao Cancelo to hammer in the equaliser.

The first corner comes to nothing. They win another. And this one really comes to nothing as it ends up back with David Raya.

Arsenal win their first corner of the game with just a few minutes left on the clock to the break.

The Gunners were prolific from set pieces last season but are yet to score from one this campaign.

Julian Alvarez has a bit of space just outside the box and he takes up the invitation, thumping a shot towards goal that goes just over.

Elizabeth Conway
BBC Sport Spanish football reporter at Metropolitano Stadium

The problem is by the time Fernandes had decided to not play the cross in and to play it around, Atletico had got everyone behind the ball and United lost possession.

That was a chance for United but it was the wrong decision by Fernandes.

Bruno Fernandes has been quiet and when he has had the ball he has been guilty of making the wrong decisions. Twice just now he's turned back to play a safe ball back when he could have chipped it into the box.

Viking are in dreamland right now. Can you believe it?

It's awful stuff at the back from Bayern but Viking won't care one bit as Peter Christiansen calmly slots beyond Jonas Urbig for a two-goal lead.

Elizabeth Conway
BBC Sport Spanish football reporter at Metropolitano Stadium

Simeone is shown a yellow card by the ref and rightly so. He's still ranting on, even as play continues.

Ally McCoist
Former Scotland striker on TNT Sports

Arsenal have got to get Eze on the ball where he picks it up in that kind of number 10 position on the left hand side.

I'd like to see Lewis-Skelly further on the outside rather than the other way around.

Image source, Getty Images