Really don't want us to sign him. He is decent at best and not worth the fee. He is not suited to our system and would be another defender who is a little bit limited on the ball. He is also 27 and still less experienced and proven than Hummels, but would cost as much. I know him for a few years now and I never thought he was something special, didn't really get in an average Argentina defence either. He had a good season overall in a pretty good Valencia defence, but that's again probably just the result of a pretty good unit rather than a really great individual imo (I wouldn't sign any of the Southampton CBs either for example).
Hummels, Godin, Laporte or Varane (unlikely), that's the one we should go out and try to get them with a big fee. Everyone else on the market is not worth that kind of money imo and then we can rather look at cheaper, young candidates, which we can develope into a United defender.