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SUNDERLAND, UNITED KINGDOM - DECEMBER 18: Leigh Griffiths of Celtic (R) scores the first Celtuc goal during The Premier League International Cup match between Sunderland U21 v Celtic U21 at the Stadium of Light on December 18, 2014 in Sunderland, England. (Photo by Ian Horrocks/Sunderland AFC via Getty Images)

SUNDERLAND, UNITED KINGDOM - DECEMBER 18: Leigh Griffiths of Celtic (R) scores the first Celtuc goal during The Premier League International Cup match between Sunderland U21 v Celtic U21 at the Stadium of Light on December 18, 2014 in Sunderland, England. (Photo by Ian Horrocks/Sunderland AFC via Getty Images)