Give him a few games in the Emirates-cup etcetera. Let's see what he's made off. If he turns out to be tremendeous, why not put him in the first team? But the best opinion, and the most logic one, would be the Primavera.
It's so easy...
Zebina/Grygera - Zapata/Legrottaglie - Chiellini/Mellberg - Zambrotta/Grosso.
Imagine we can get both Zambrotta and Grosso and play:
Zambrotta - Zapata - Chiellini - Grosso.