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SHEFFIELD, ENGLAND - MAY 24: Kell Brook during a public workout at the Peace Gardens on May 24, 2017 in Sheffield, England. Brook fights American Errol Spence at Bramhall Lane on Saturday to defend his IBF World welterweight title. (Photo by Nigel Roddis/Getty Images)

SHEFFIELD, ENGLAND - MAY 24:  Kell Brook during a public workout at the Peace Gardens on May 24, 2017 in Sheffield, England. Brook fights American Errol Spence at Bramhall Lane on Saturday to defend his IBF World welterweight title. (Photo by Nigel Roddis/Getty Images)