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Chelsea's Brazilian-born Spanish striker Diego Costa (C) celebrates scoring his team's third goal with Chelsea's Brazilian midfielder Oscar (L) and Chelsea's Brazilian midfielder Willian during the English Premier League football match between Crystal Palace and Chelsea at Selhurst Park in south London on January 3, 2016. AFP PHOTO / 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. / AFP / ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP via Getty Images)

Chelsea's Brazilian-born Spanish striker Diego Costa (C) celebrates scoring his team's third goal with Chelsea's Brazilian midfielder Oscar (L) and Chelsea's Brazilian midfielder Willian during the English Premier League football match between Crystal Palace and Chelsea at Selhurst Park in south London on January 3, 2016. AFP PHOTO / 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. / AFP / ADRIAN DENNIS        (Photo credit should read ADRIAN DENNIS/AFP via Getty Images)