The pair have history, with the legendary Italian boss having tutored the former forward while at Juventus in 1993, and even clashed following a pre-season game when the striker pushed the manager over after just five minutes of a close-season friendly.But, the 74-year-old believes his former charge has matured from the "abrasive and confrontational" nature of before and will now make a fine head coach at the Stadium of Light."Paolo was a fantastic, creative player and as a player he was a little bit strange as I discovered when I was his manager," Trapattoni is quoted as saying by the Daily Mail."He can be a good manager now because he will have learned how to deal with players. When he went to England to play it gave him more experience."I know he was in Rome a long time ago, it is the capital and it is a different place for him and he is very proud to come from there."But England was also a different place for him and a new experience in his life and he matured there and he grew. It was a different situation for him and he changed there for sure."I wish him well and wish to give him my congratulations that he has become a manager."He was abrasive and confrontational as a player and I saw that but that is his character. He can be a good manager, I am sure."