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Manchester United's Welsh assistant manager Ryan Giggs (R obscured) shakes hands with referee Mark Clattenburg (L) as Manchester United's Dutch manager Louis van Gaal (R) and Liverpool's German manager Jurgen Klopp (2L) look on after the English Premier League football match between Liverpool and Manchester United at Anfield in Liverpool, northwest England, on January 17, 2016. Wayne Rooney scored the winning goal in Manchester United's 1-0 victory over Liverpool. AFP PHOTO / PAUL ELLIS 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 75 images, no video emulation. No use in betting, games or single club/league/player publications. / AFP / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP via Getty Images)

Manchester United's Welsh assistant manager Ryan Giggs (R obscured) shakes hands with referee Mark Clattenburg (L) as Manchester United's Dutch manager Louis van Gaal (R) and Liverpool's German manager Jurgen Klopp (2L) look on after the English Premier League football match between Liverpool and Manchester United at Anfield in Liverpool, northwest England, on January 17, 2016. Wayne Rooney scored the winning goal in Manchester United's 1-0 victory over Liverpool. AFP PHOTO / PAUL ELLIS

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 75 images, no video emulation. No use in betting, games or single club/league/player publications. / AFP / PAUL ELLIS        (Photo credit should read PAUL ELLIS/AFP via Getty Images)