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Chelsea's Brazilian-born Spanish striker Diego Costa (C) celebrates with teammates after scoring the opening goal of the English Premier League football match between Chelsea and Watford at Stamford Bridge in London on December 26, 2015. AFP PHOTO / GLYN KIRK 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. / AFP / GLYN KIRK (Photo credit should read GLYN KIRK/AFP via Getty Images)

Chelsea's Brazilian-born Spanish striker Diego Costa (C) celebrates with teammates after scoring the opening goal of the English Premier League football match between Chelsea and Watford at Stamford Bridge in London on December 26, 2015. AFP PHOTO / GLYN KIRK 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. / AFP / GLYN KIRK (Photo credit should read GLYN KIRK/AFP via Getty Images)
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