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Manchester City's players wear special shirts with the number of Manchester City's German midfielder Ilkay Gundogan on the front ahead of the English Premier League football match between Manchester City and Arsenal at the Etihad Stadium in Manchester, north west England, on December 18, 2016. Manchester City's German midfielder Ilkay Gundogan has picked up a serious injury and will be out for many months. / AFP / 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. / (Photo credit should read PAUL ELLIS/AFP via Getty Images)

Manchester City's players wear special shirts with the number of Manchester City's German midfielder Ilkay Gundogan on the front ahead of the English Premier League football match between Manchester City and Arsenal at the Etihad Stadium in Manchester, north west England, on December 18, 2016.
Manchester City's German midfielder Ilkay Gundogan has picked up a serious injury and will be out for many months. / AFP / 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.  /         (Photo credit should read PAUL ELLIS/AFP via Getty Images)