Former Manchester United goalkeeper Massimo Taibi has paid tribute to Sir Alex Ferguson following his retirement announcement.

Taibi had a short stint at United under Ferguson.

"With his farewell closes an incredible era for United. Ferguson is an institution. For thirty years he has made the fortunes of his team.

"Ferguson has left an incredible mark not only on Manchester United or English football, but throughout the world of football. He has won so much, perhaps everything he could win, even managing to launch a large number of players.

"Replacing him will be difficult if not impossible."