No one said he's a Diego going forward but Sissoko playing deeper up the pitch will allow us better ball recovery. Him and Melo next to each other reminds me of the one-dimensional Capello or Ranieri midfield.

And we dont have to be way back the pitch, Sissoko can still move around the middle to win balls, while Melo can stay closer to the defence, when needed.
Anyway, this i how i see it.. I really think a 4-2-3-1 is great for the players we have at the moment.. With some out injured..
