Chelsea's Brazilian-born Spanish striker Diego Costa (C) appeals the referee for a foul during the English Premier League football match between Sunderland and Chelsea at the Stadium of Light in Sunderland, north-east England on December 14, 2016. / AFP / Oli SCARFF / 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 OLI SCARFF/AFP/Getty Images)