The young striker won new admirers for his Euros campaign earlier this summer.
Mancini told the Daily Mail: "I think that he did well in the Euros. I also hope those performances can help him to improve. I think every time he plays well, like he did at the Euros, it's important for him because it can help him with his behaviour. Then he can understand that, if he improves his behaviour, he can be better at his job.
"With his body and his attitude, I think he can play as a forward or like a winger, so I think he can play in every position. Maybe, for me though, he is better like a first striker. But we have four strikers, and of these four strikers, only Mario can play wide."