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LONDON, ENGLAND - AUGUST 13: Slaven Bilic manager of West Ham United during training at Chadwell Heath on August 13, 2015 in London, England. (Photo by Arfa Griffiths/West Ham United via Getty Images)

LONDON, ENGLAND - AUGUST 13:  Slaven Bilic manager of West Ham United during training at Chadwell Heath on August 13, 2015 in London, England.  (Photo by Arfa Griffiths/West Ham United via Getty Images)