Problem is if Wenger is willing to drop Cazorla, Ramsey or Ozil from time to time, otherwise you have to play diamond midfield, which I don't think will be bad since it won't give width but you will have two options upfront to pass to instead of one main striker. (justarsenal.com)
Have to say though, for the guy at the top of their 4 man diamond midfield he didn't do much with the ball — and he makes Flamini look quite «long - fused» and hesitant in the tackle. (justarsenal.com)
Another possibility was the 4 -3-1-2 diamond midfield, with Coutinho playing off of Sturridge and Benteke. (anfieldindex.com)