Bernardo Silva was rejected by Manchester City as a teenager.
Super agent Jorge Mendes touted the Portuguese star when he was an emerging force at Benfica but City opted not to make a move.
In an extract from the book 'Pep's City: The making of a Superteam' published by Goal, it was revealed that Mendes had said: "You need to realise that Bernardo's going to become the best in the world."
He eventually joined the club for £43m.
Silva, 25, has emerged as one of City's most important players and was nominated on the long list for this year's Ballon d'Or.