Nobody, because we shouldn't even be fielding this formation.
Funny thing is, people complain about changing the system when we don't have the players for it anyway, citing that we need the straight 4-4-2 because Molinaro and Grygera are terrible, yet they defend playing them all the time. All this commotion of whether or not we should sign Diego is based on the fact we have terrible fullbacks, yet people complacently praise Molinaro when he makes a good cross and are afraid to ask for another player back there.
It's all rubbish and hypocrisy. We use a system that we shouldn't be using right now just because of two positions on the pitch. It's absurd really.