I've wanted a clear first choice centre half for quite some time now, and thought it was our most important position to upgrade this summer. Can't say much about how good Sakho is, as I've hardly seen him play, but he seems to be just the sort of CB I wanted us to get, if what I've read about him is right.
Quick, powerful, good on the ball and in the air, still quite young, but with plenty of experience already and captain of his side since a very young age. Hopefully he'll be the leader our defence needs, for years to come.