Real Madrid legend Jorge Valdano believes Cristiano Ronaldo's unrivalled ego is the main motivation behind his incredible list of achievements.
Ronaldo declared himself the "best player in history" after winning a fifth Ballon d'Or last week , equalling Lionel Messi's record mark.
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His comments sparked fresh discussion from current and former players as to his place among the game's greats and how he compares to the Barcelona star.