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Chelsea's Spanish striker Diego Costa attends a team training session at Chelsea's training ground in Stoke D'Abernon, south of London, on July 31, 2015, ahead of their FA Community Shield match against Arsenal on Sunday. AFP PHOTO / GLYN KIRK NOT FOR MARKETING OR ADVERTISING USE / RESTRICTED TO EDITORIAL USE (Photo credit should read GLYN KIRK/AFP/Getty Images)

Chelsea's Spanish striker Diego Costa attends a team training session at Chelsea's training ground in Stoke D'Abernon, south of London, on July 31, 2015, ahead of their FA Community Shield match against Arsenal on Sunday. AFP PHOTO / GLYN KIRK  NOT FOR MARKETING OR ADVERTISING USE / RESTRICTED TO EDITORIAL USE        (Photo credit should read GLYN KIRK/AFP/Getty Images)