Paul Scholes has revealed that Park Ji-sung was 'a nightmare' in training - because he was one of the best man-markers he ever had to play against.
Park joined United for just £4m in 2005 but went on to become one of Sir Alex Ferguson's most reliable players throughout his seven years at Old Trafford - with his trophy haul including four Premier League titles and a Champions League triumph.
The South Korean midfielder even kept Scholes out of the starting lineup for United's Champions League defeat to Barcelona in 2009.
Scholes said he learned to become one of the greatest midielders of his generation by watching other players when he was growing up.
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