Chainsaw
Killahead
Conveniently left out Robinho. Besides Ibra doesn't drop, no need for him to be lightning fast. And you forget Pato too, and offside king Inzaghi whose positioning makes up for lack of pace.
Thiago Silva is injured but the knockouts are far away (still doubt he'll be back but you never know).
Anyway, I have overstated the counter-attacking case, but you have got to keep in mind that this is the CL and competent tactical, defensive play often wins the day. There's a reason Milan have been so successful in the CL. And they will continue to be good in the knockouts. I don't want to draw them - i'd gladly draw Roma though.
Pato is an inconsistent player and is most of times injured. Robinho is half danger as he's mostly play like a clown. Inzaghi is out for the rest of season. It's only Il Nose that can be a danger though.
Anyhow, You can only play defensive if you have top defenders, DMs and GK. Not AC Milan that their best defender is an aged Nesta. Antonini is a joke, Zambrotta is way passed his prime and Silva's likely replacement Bonera is nothing better than Antonini in being a joke. Let's not even talk about Abbiati.