Mancini tried to sign the 24-year-old during the recent transfer window, but despite claiming that he was close to striking a deal, the move failed to materialise as Fiorentina apparently had a late change of heart.
Nevertheless, Mancini remains desperate to land a player he has admired for a long time.
"I have followed him since his days at Pisa in the 2007-08 season. He was just 20 but immediately did things that were extraordinary.
"He is one of the few players who are able to win a game on their own. If I could have I would have brought him to the Premier League a year ago.
"We have tried again this summer because I thought he might make an important contribution and mix well with the players here at City.
"But we could not complete the transaction and in all honesty I must say that I understand Fiorentina."