Rio Ferdinand has claimed that Cristiano Ronaldo's obsession about being the best saw him become the most influential player in the Manchester United dressing room.
After joining United as a relatively unknown teenager Ronaldo went on become one of the world's greatest players before sealing a world record transfer to Real Madrid in the summer of 2009 after six years at Old Trafford .
Former team-mate Ferdinand, who played alongside the Portuguese forward, throughout his time at the club admits that Ronaldo's mindset was the strongest he ever encountered in his career and it helped turn the now Juventus star 'from a boy to a man.