Rio Ferdinand has lifted the lid on a training ground bust-up between Cristiano Ronaldo and Ruud van Nistelrooy, believing it helped the Portuguese become the superstar he is today.
Signed for £12.5million by Sir Alex Ferguson from Sporting Lisbon in 2003, Ronaldo was given a rude awakening to life in the Premier League upon his arrival in Manchester.
The young, raw talent, billed as David Beckham's successor, did not immediately set pulses racing at Old Trafford and also left his team-mates frustrated in training.
Indeed, Van Nistelrooy - who was United's main man at the time - made his feelings known to the fresh-faced teenager during a routine training session.
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