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Chelsea's Brazilian-born Spanish striker Diego Costa appeals unsuccessfully for a penalty during the English Premier League football match between Chelsea and Southampton at Stamford Bridge in London on March 15, 2015. AFP PHOTO / 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 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. (Photo credit should read BEN STANSALL/AFP/Getty Images)

Chelsea's Brazilian-born Spanish striker Diego Costa appeals unsuccessfully for a penalty during the English Premier League football match between Chelsea and Southampton at Stamford Bridge in London on March 15, 2015. AFP PHOTO / 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 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS.        (Photo credit should read BEN STANSALL/AFP/Getty Images)