5) Gerard Pique
A highly rated young Spaniard during his time at Manchester United, Gerard Pique was unable to break into the first-team due to the presence of a legendary English defender in Rio Ferdinand.
Ferdinand was absolutely superb alongside Serbian colossus Nemanja Vidic, and it’s perhaps unsurprising that Pique wasn’t able to break the partnership.
That said, Pique has since gone on to become one of the best in the world at Barcelona while United stuck with players like Jonny Evans, Phil Jones and Chris Smalling – the kind of homegrown talent many feel isn’t given a chance.
6) Adnan Januzaj
A current player struggling to make a breakthrough for Manchester United, Belgian winger Adnan Januzaj looked superb for the club last season – a lone spark in an uninspiring campaign under David Moyes.
That impressive form earned him a place in his country’s World Cup squad, but the 20 year-old has since fallen out of favour at Old Trafford.
However, given the current form of Red Devils wide players Ashley Young and Juan Mata – and the fact that Angel Di Maria is also currently barely able to trouble the starting line-up – perhaps Januzaj must simply keep working hard and wait for another chance.