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Manchester United's English midfielder Michael Carrick (R) falls over Cambridge Unite's English midfielder Cameron McGeehan during the FA Cup fourth round football match between Cambridge United and Manchester United at The R Costings Abbey Stadium in Cambridge on January 23, 2015. AFP PHOTO / ADRIAN DENNIS == RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. == (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)

Manchester United's English midfielder Michael Carrick (R) falls over Cambridge Unite's English midfielder Cameron McGeehan during the FA Cup fourth round football match between Cambridge United and Manchester United at The R Costings Abbey Stadium in Cambridge on January 23, 2015. AFP PHOTO / ADRIAN DENNIS   == RESTRICTED TO EDITORIAL USE. No use with unauthorized audio, video, data, fixture lists, club/league logos or live services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications.  ==        (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)