Ravel Morrison was highly-rated by everyone as a teenager and was the star of a Red Devils side that won the FA Youth Cup in 2011 by beating Sheffield United.
However, his career never really took off and he was released a year later, with Rio Ferdinand revealing that former manager Sir Alex Ferguson told him to steer clear of the young midfielder, who is now a Sheffield United player, on loan at Middlesbrough.
"Fergie told me to step away from doing stuff with Ravel," Ferdinand said on the Beautiful Game podcast. "He told me the club would deal with the situation. He could have become a £100million player.
"Ravel was chatting to someone sent to look after him, just chatting nonsense with this guy then would go do what he wanted to do.
"It's a tricky situation because some of these kids' home lives are more difficult than we know about. You have to steer him. His talent, I haven't seen a kid of that age at 14, 15 like that in my life. The game comes so easy to him. It's effortless. But ability will only get you so far, mentality and attitude will take you to the top and help you stay there."
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