I think that some of these players would be great addition for Juve squad...
Defenders:Barzagli,Zaccardo,Zapata,Vargas
Midfielders:Van der Vaart,Diego,Piatti,Quaresma,Lucho Gonzales,Moutinho(i heard he is good)
Attackers:Eto'o,Huntelaar,Aguero
And maybe someone else...