Don't think he could have done much about the goal, otherwise fine
Could he have done more to stop the cross for the goal? Did make a very important block to save a certain first half goal
Defended well against Kane for most of the game, made 5 clearances
Solid, won his headers, especially from Bayern's many corners
Did fine, had one moment when Sane ran past him, but otherwise defended stoutly, made tackles
Was often looking for a bit more from those ahead of him, made 4 tackles (more than any other Arsenal player)

He looks tired at the moment

He did look the most likely to make something happen up the attacking end but it never quite came off

A quiet game, he too looks tired. 0 shots, 0 dribbles, and a terrible corner right at the end when we needed him to deliver something good
Looked lively enough, worked hard to help Tomi, had a decent first half chance, but caught out for their goal
Put himself about, but barely impacted the game

Tried but nothing really came off him beyond winning a couple of free kicks

That moment late on when he failed to cross then gave away a free kick was frustrating because we needed moments like that to get anything

Not on long enough to rate
To be quite honest, I'm not in the mood, so 0/10 for me, I guess