Well that was an awkward moment for Arsenal. Mikel Arteta, usually so reliable, gave the ball away in the middle of the pitch and Milan are able to surge forwards. Most of the danger is averted when an attempted pass by Zlatan Ibrahimovic goes a little bit wrong, but Ignazio Abate's cross ends up getting deflected, causing Wojciech Szczesny some major problems as it flies into the side netting for a corner.
Meanwhile, veteran midfielder Clarance Seedorf appears to have hurt himself, and Milan warmed up Urby Emanuelson in case he can't continue. He tries to soldier on but ultimately is forced off the pitch in the 12th minute, and Emanuelson takes his place. Presumably he'll play deep as Kevin-Prince Boateng pushes forwards.
Emanuelson nearly announces his arrival with a bang after getting on the end of Ibrahimovic's flick in the penalty box, but the midfielder's first time flick is well wide of Szczesny's post. Laurent Koscielny isn't doing the best of job in stopping Ibrahimovic causing damage just yet.