I was intrigued to see how good this lad was, having read absolute rave reviews about him when he was out on loan at Borussia Monchengladbach. I have to say I've been seriously impressed with him this season. I think the Chelsea defence looks far more solid when he plays and he just strikes me as so calm and composed on the ball. It's scary to think that he looks this good already and he's only 21! Chelsea have a seriously good player on their hands, here.