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LONDON, ENGLAND - AUGUST 08: Gary Cahill of Chelsea and Gylfi Sigurdsson of Swansea City compete for the ball during the Barclays Premier League match between Chelsea and Swansea City at Stamford Bridge on August 8, 2015 in London, England. (Photo by Julian Finney/Getty Images)

LONDON, ENGLAND - AUGUST 08: Gary Cahill of Chelsea and Gylfi Sigurdsson of Swansea City compete for the ball during the Barclays Premier League match between Chelsea and Swansea City at Stamford Bridge on August 8, 2015 in London, England.  (Photo by Julian Finney/Getty Images)