Chelsea's English defender Gary Cahill (L) dives tohead the ball towards goal, after it rebounded off of the post following Chelsea's Spanish defender Marcos Alonso's free-kick, during the English Premier League football match between Crystal Palace and Chelsea at Selhurst Park in south London on December 17, 2016. / AFP / 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 75 images, no video emulation. No use in betting, games or single club/league/player publications.  /         (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)