Canna played good for italy last week. I think his form has more to do with the current Madrid mantality and the tactical setup in spain which seems to leave CB's more exposed than in italy where they are always protected. Canna seems to be scampering around covering holes and then getting caught out and what not. Like his teammates do not know how to lay themselves out on the field properly.
Barzagli is a very good player and can improve alot at Juve. I would not mind seeing Canna back to partner Barzagli for a year or 2 and help bring Criscito through but Barzagli would do well with another experienced defender such as Heinze or Alex or Pepe or Samuel. It is important that we have quality CBs because this is what title winning sides are built on and i feel the directors know that because they talk alot of defenders