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PAISLEY, SCOTLAND - JULY 10: New signing Nadir Ciftci of Celtic makes his debut during the Pre Season Friendly between Celtic and Real Sociedad at St Mirren Park on July 10th, 2015 in Paisley, Scotland. (Photo by Jeff Holmes/Getty Images)

PAISLEY, SCOTLAND - JULY 10: New signing Nadir Ciftci of Celtic makes his debut  during the Pre Season Friendly between Celtic and Real Sociedad at St Mirren Park on July 10th, 2015 in Paisley, Scotland.  (Photo by Jeff Holmes/Getty Images)