We've almost never played him as a centre back, but his positioning is usually suspect as left back as he comes in too central - maybe this won't be a problem if central is his actual position! But when he's at centre back we miss his pace and crossing down the left wing. Maybe he should be given the chance to play at centre back a bit more and see how he fares over a longer period. He's certainly got the pace and power, but I'm not yet sure about aerial ability or the interceptions and passing that Blanc has for example.