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SUNDERLAND, ENGLAND - JULY 03: Sunderland unveil new signing Adam Matthews at the Academy of Light on July 3, 2015 in Sunderland, England. (Photo by Sunderland AFC/Getty Images)

SUNDERLAND, ENGLAND - JULY 03:  Sunderland unveil new signing Adam Matthews at the Academy of Light on July 3, 2015 in Sunderland, England.  (Photo by Sunderland AFC/Getty Images)