What I saw there kind of reinforced some worries I had about him. He's a bit rash and goes into challenges rather than holding the player off and making a standing tackle but worse is that he has a tendancy to run past the ball into advanced midfield areas despite playing as a CB. That ill discipline will need to be cut oit of his game by Arteta and hopefully as a fullback it won't be costly.
But on the positives, he passes the ball well, keeps possession well when on the ball and seems quick on his feet. Just his off ball movement seems to me like someone who feels he should be playing further up the pitch.