Davide Santon is a great player, but you may have to pay a lot of money as he is with Inter and they are your rivals!
I would also reccomend Carlos Vela who is one of the best wonderkids on the game!
Toni Kroos, Sahko, Henri Saivet, Pato, Ljajic are all very good too!
If you need a good keeper then I would recccomend Fiorillo or Akinfeev.