It would be cruel if Ferrara didn't start him. This should be his last chance, though.
If he's lethargic again, then Giovinco deserves to be the fourth choice beside Diego under a striker (also, Diego's sub).
That would be a great formation, but Trezeguet would commit suicide.
P.S. I really want Trezeguet to play tomorrow. I hope he bounces back against Lazio.