£900,000 is worth the risk for a international, who's won everything in Holland and pushed far in the champions league. Also, people saying how slow he is.. If you've ever seen him play you would know that he's significantly faster than most centre backs. He's not the fastest by any stretch but fast enough. Also, one of his strengths is his positioning he fills gaps brilliantly, cuts off the pitch well and is a clear threat at corners ( scores a lot of headed goals ). I don't think he's here for the bench he'll play in back three and be a cover for wing back. Tottenham were trying to sign him a couple years ago.