Can left Juve in January for a return to Germany.
On Ronaldo, he told BILD: "I have seen how he lives, with his winning mentality. If he loses a training match he is in a bad mood. On the contrary, if he wins he celebrates it and makes it weigh on the losers. He is a driver."
On moving to Dortmund, he also said: "I came here because I want to win the title and not consolidate second place behind Bayern Munich. The environment at BVB is very similar to that of Liverpool, they have a very familiar club and unique fans. And not surprisingly, both clubs love (Jurgen) Klopp."