I haven't seen him play apart from the friendly against Val di Susa...but i think you should give him a chance, he is here as back up and will play when there are injuries/suspensions/coppa italia/rotation.
He needs time to settle, he just went from living in a place liek Napoli were you are a legend for just wearing their shirt, to a place like juventus, where the only person he knows is Fabio...i think he'll be a good squad player in time!