A lot of these deals will depend on the midfield transfers of Roma and Juventus.
One between Bertolacci and Nainggolan is staying at Roma, there's no way in hell that Roma is losing both midfielders, though depending on how good Strootman is physically, Roma might buy both midfielders. It will get some cash from Gervinho and maybe some cash from Pjanic (or Strootman if Van Gaal is still interested).
On the other hand, now that they bought Khedira, Juventus will press for Nainggolan only if they sell one of Vidal/Pogba or if Pirlo leaves.
Too many ifs, personally I think there's at most 25% chance of getting Bertolacci.
A midfield of Bonaventura, Montolivo, Bertolacci would be an upgrade over Muntari De Jong Poli that we had this season, especially in terms of ball control and creativity.
I also doubt we'll get both Bertolacci and Kondogbia especially if we're gonna play a 4-2-3-1 as mentioned in some media (though doubt Berlusconi will like a formation without two strikers)