#9 David Platt
David Platt was a product of Manchester United's youth academy who signed a professional contract with the club in 1984. However, after a mere six months, the Englishman found himself at Crewe Alexandra in the Fourth Division after being discarded by the club.
To his credit, he bounced back and showed them how wrong they were in letting go of him. He achieved success with the likes of Juventus and Arsenal, becoming a key player for the English national side.
As for Manchester United, they were left with another transfer blunder to rue about.
Edited by Amit Mishra