Actually Vanstrattan is gonna be our third goalkeeper, and Novembre will be playing for Primavera.
As for Zalayeta's replacement, I don't think it's needed right now, as we're not gonna play in CL this year. So four strikers for the league is enough. That said, following Zalayeta's transfer, I think we don't have a proper player to replace Trezeguet if he gets injured (I hope he doesn't though). But IMO Del Piero, Palladino, Iaquinta and Trez can do the job for this season.