6. Nemanja Vidic
The Serbian was an unknown to most fans when Manchester United signed him for €10.50m from Spartak Moscow in 2006.
A difficult debut campaign followed before Vidic stepped up and proven himself alongside Rio Ferdinand in defence. To this day, fans still rate them as one of the best centre-back pairings in history.
Vidic made 300 appearances for the Red Devils while winning five Premier League titles, three League Cups and the Champions League.
Fans remember him for not shying away from a challenge and in becoming a solid wall in the United defence.