One thing Sir Alex Ferguson always promoted was the academy system and youth player development.
Even before the Scot's long and successful reign with Manchester United, the club's academy churned out some incredible players, such as George Best, Bobby Charlton, Jackie Blanchflower and Norman Whiteside.
Players were always given the chance to succeed through the academy and be promoted to the first team under Ferguson, who most famously brought through the generation of Ryan Giggs, Paul Scholes, David Beckham and Gary Neville amongst others.
They went on to lay the foundations of a team that had major success in both domestic and European competition.
Even now, the United team that Ferguson has left for David Moyes features academy products like Jonny Evans, Tom Cleverley, Danny Welbeck and the recovering Darren Fletcher.
Some, though, have inevitably failed to make the grade at one of England's biggest clubs - and had to seek glory elsewhere.
Some of them have still been very successful despite this initial rejection - and here are five of them who in recent times have been turned down by the Red Devils and proved their worth elsewhere.