Totally agree with Ammaar about Gibbs.
It's a really big game and he is going to get tested, it's far to risky to throw him in without any minutes in the preceding games. I would imagine that this is how Wenger sees the situation.
For me it's got to be Miquel or Coquelin. Probably Coquelin, his energy and commitment to his game is really encouraging - Flamini esque. He could always play Vermaelen there again, but I'm sure TV will be at CB. We've still got Santos to come back at LB and I think Wenger deserves credit for ensuing we've got options there following Clichy's departure.
I also agree that we need to set out to score in Milan. The away goal is a massive advantage and we've got it in our locker to score. It's how we are best set up to play.