It all depends on the other midfielders partnering him and if his role is attacking only or attacking plus sharing in defending. But generally, I think he fits in 4-1-2-1-2.
Zanetti
Camoranesi-------------Nedved
Lampard
With Nedved and Camoranesi share more in defending and Lampard changes positions with Nedved according to the flow of the game. But in this case, at least either the right or the left back should be offensively competent.