6. Petr Cech
With Peter Schmeichel out of the picture and United struggling to find a suitable replacement, Sir Alex looked overseas for someone with a bit more potential to grow into the role. He stumbled across the young Czech international and sought to put a deal in place only to back out early on. Cech then joined Chelsea, where he remains, and went on to become on of the Premier League’s most decorated and revered goalkeepers.