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LONDON, ENGLAND - SEPTEMBER 19: Diego Costa of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on September 19, 2015 in London, United Kingdom. (Photo by Ross Kinnaird/Getty Images)

LONDON, ENGLAND - SEPTEMBER 19:  Diego Costa of Chelsea during the Barclays Premier League match between Chelsea and Arsenal at Stamford Bridge on September 19, 2015 in London, United Kingdom.  (Photo by Ross Kinnaird/Getty Images)