Arsenal's Brazilian defender Gabriel (L) and Chelsea's Brazilian-born Spanish striker Diego Costa (2nd R) are separated by Arsenal's Czech goalkeeper Petr Cech (C) as they clash during the English Premier League football match between Chelsea and Arsenal at Stamford Bridge in London on September 19, 2015. AFP PHOTO / IAN KINGTON 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. (Photo credit should read IAN KINGTON/AFP/Getty Images)
