With Scholes retiring we need more than one central midfielder. Both Sneijder and Modric are good players but who really knows if they are the right choices? Personally I like Schewiestiger, but he's likely not available. Others talk about Pastore and Hamsik and maybe we are interesting in Young because he could be moved inside. Nasri is another player who looks good when he is asked to play inside and Arsenal seem to be having trouble getting him to sign a new contract.
United also need a DM, someone like Yvan M'Vila or Daniele De Rossi, because we have really missed Hargreaves the last year or so. But when you add David de Gea and Raphael Varane, that's five players and well over a £100m. I can't see that happening even if rumours of a clean out are true.