10. Cristiano Ronaldo
At the club: 2003 - 2009
Appearances: 292
Goals: 118
Honours: 3 x Premier League; 1 x FA Cup; 1 x UEFA Champions League; 1 x FIFA Club World Cup
His star may have risen highest after he left the club, but it would take a short-sighted, mean, man to overlook just how good Cristiano Ronaldo was during his brief, but oh! so sweet, peak at Old Trafford.
He is, after all, one of only four players to have won the Balon d'Or whilst playing for Manchester United.
As the astute Gary Neville once said "When he was at United, between 2006 and 2008, I still maintain that’s his best two football years as a football player, in terms of his contribution through the whole game" - and thinking about it with cold logic, Neville's right, of course.
Between those two, three, years Ronaldo was the best footballer on the planet - someone who won matches and decided titles on his lonesome - and he more than made a decent shout of being arguably the best footballer (in terms of pure skill and impact on matches) to have worn a United shirt.