I wish they would just make the move now, whats the reason to wait until the summer? I always feel most forum members here would do a much better job than Zubi. Its not that difficult, pay the fee, sign the guy and be done with it, totally worth it.
Not do nothing and wait and then make a gesture by biding for Thiago Silva or Kompany and then scratch your head going "hey atleast we tried, but we still have dmf's or injured players who might play there..."
Roma don't want any old bid. He knows the top teams will be after a CB, and will want top dollar.
City, Barca, Bayern... All looking for a cb, and if they would prefer to wait to get an extra £5-£10m, they will. They're in no position to hurry whatsoever.
However, if somebody bid a fee that was HUGE, then they may just agree to the deal now, but I'm talking £30m+ Which I don't know if any of them teams would come in with a straight 30m no questions asked type of deal.
Mangala, Hummels, Laporte all other CB's that could be acquired too. It's a game of chess atm.