Former Juve coach Ferrara, speaking with Gazzetta dello Sport, was asked about controversial midfield pair Melo and Diego.
On Melo, Ferrara said: "He has qualities, but must learn to be loving to his teammates. He's anything but a bad guy, but the arrogance he has did irritate many, and if someone is nasty to others, it is shown on the field."
On Diego, the former Juve defender added: "He is absolutely required. He's good and trains with commitment. He needs two deep-lying midfielders, because his strength is to launch attacks."
Asked about going from player to coach, Ferrara insisted: "It wasn't a problem for me. I always made decisions with my head, not my heart. Sometimes, the players did not understand ..."