I think he was a little shaky against LA Galaxy - definitely our worst player, even if he didn't screw up majorly, just the rest of our players were more impressive. However I seemed to be in a minority with this opinion, so I payed special attention to his performance against Roma and I think it was a game of two halves for him. The first 30 minutes he was very poor. He had 6-7 defensive mistakes in that period - 2 of them could've lead to a goal, if Destro was a more composed finisher. Couple other times he was very lucky James managed to bail him out. What I didn't like especially was that every time when he was beaten by Destro, he was raising his hand and trying to claim offside instead of busting a gut and trying to recover - not a good sign for a young player.
However after the first 30 minutes he improved and for the rest of the game he made only 2-3 smaller mistakes. That's encouraging and if he keeps improving he should be able to make a good backup for the left sided CB for the season. Still very far from being a starter thou, so buying a left sided CB is a must.