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MANCHESTER, ENGLAND - FEBRUARY 03: Luke Chadwick of Cambridge United and Paddy McNair of Manchester United battle for the ball during the FA Cup Fourth round replay match between Manchester United and Cambridge United at Old Trafford on February 3, 2015 in Manchester, England. (Photo by Alex Livesey/Getty Images)

MANCHESTER, ENGLAND - FEBRUARY 03: Luke Chadwick of Cambridge United and Paddy McNair of Manchester United battle for the ball during the FA Cup Fourth round replay match between Manchester United and Cambridge United at Old Trafford on February 3, 2015 in Manchester, England.  (Photo by Alex Livesey/Getty Images)