Chelsea's Brazilian-born Spanish striker Diego Costa (C) has a shot blocked by the efforts of Arsenal's Czech goalkeeper Petr Cech (L) and Arsenal's French defender Laurent Koscielny (R) during the English Premier League football match between Arsenal and Chelsea at the Emirates Stadium in London on September 24, 2016.  / AFP / Ben STANSALL / 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 BEN STANSALL/AFP/Getty Images)