On par with Sissoko I would say.
Diego might seriously challenge but only time will tell.
The perfect summer:
IN: Diego, Hamsik, Lahm, Guberti, Criscito, Cannavaro.
OUT: Trezeguet, Tiago, Zebina, Knezevic, Marchioni.
Buffon
Lahm Cannavaro Chiellini Criscito
Marchisio Sissoko...