LONDON, ENGLAND - DECEMBER 26: Diego Costa of Chelsea scores his team's second goal during the Barclays Premier League match between Chelsea and Watford at Stamford Bridge on December 26, 2015 in London, England. (Photo by Clive Rose/Getty Images)
LONDON, ENGLAND - DECEMBER 26: Diego Costa of Chelsea scores his team's second goal during the Barclays Premier League match between Chelsea and Watford at Stamford Bridge on December 26, 2015 in London, England. (Photo by Clive Rose/Getty Images)