I can only remember one time when he won a 1 against 1 in the first half which he was actually tested by Bologna's attack. He had a quiet game overall. Not a great opportunity to judge his defensive abilities.
If he continues performing like this, then Conte should partner him up with Barzagli and move Chiellini to LB. Giorgio has been a beast in both positions and I would rather see him in the left than De Ceglie.