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LONDON, ENGLAND - AUGUST 08: Diego Costa of Chelsea is challenged by Ashley Williams of Swansea City during the Barclays Premier League match between Chelsea v Swansea City at Stamford Bridge on August 8, 2015 in London, England. (Photo by Mike Hewitt/Getty Images)

LONDON, ENGLAND - AUGUST 08:  Diego Costa of Chelsea is challenged by Ashley Williams of Swansea City during the Barclays Premier League match between Chelsea v Swansea City at Stamford Bridge on August 8, 2015 in London, England.  (Photo by Mike Hewitt/Getty Images)