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LONDON, ENGLAND - DECEMBER 26: Diego Costa of Chelsea celebrates scoring their second goal with Cesar Azpilicueta of Chelsea during the Barclays Premier League match between Chelsea and West Ham United at Stamford Bridge on December 26, 2014 in London, England. (Photo by Clive Rose/Getty Images)

LONDON, ENGLAND - DECEMBER 26:  Diego Costa of Chelsea celebrates scoring their second goal with Cesar Azpilicueta of Chelsea  during the Barclays Premier League match between Chelsea and West Ham United at Stamford Bridge on December 26, 2014 in London, England.  (Photo by Clive Rose/Getty Images)