Chelsea's Spanish midfielder Juan Mata (C) walks off the pitch after being substututed during the English Premier League football match between Chelsea and Crystal Palace at Stamford Bridge in London on December 14, 2013. Chelsea won 2-1. AFP PHOTO / GLYN KIRKRESTRICTED 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 by GLYN KIRK / AFP via Getty Images)
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