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Chelsea's Brazilian-born Spanish striker Diego Costa (2nd L) scores 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 / OLLY GREENWOOD 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 / OLLY GREENWOOD (Photo credit should read OLLY GREENWOOD/AFP via Getty Images)

Chelsea's Brazilian-born Spanish striker Diego Costa (2nd L) scores 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 / OLLY GREENWOOD

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 / OLLY GREENWOOD        (Photo credit should read OLLY GREENWOOD/AFP via Getty Images)