Forward's temperament is not to be feared...
The often controversial youngster has been heavily linked with City this summer, despite some concerns about his volatile mentality.
But Vieira insists that the Italian's temper is a sign of how much he cares about playing football and he is similar in that regard to several players already at the City of Manchester Stadium.
"He is a really exciting player. There is no doubt about his qualities as a football player - he is young and talented and that is really good for the future as well," Vieria told reporters.
"He is similar to Craig and Carlos. Players have their own temperament, and their own way of behaving, but what is important is that everything a player has to do, he does it for the football club.
"He hasn't signed for us yet but he is a young talented player who enjoys his game.
"He is a good goalscorer who makes scoring goals look easy. He doesn't need five chances to score a goal."