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PAISLEY, SCOTLAND - JULY 01: Michael Duffy of Celtic in action against Den Bosch during the Pre Season Friendly between Celtic and De Bosch at St Mirren Park on July 01, 2015 in Paisley, Scotland. (Photo by Jeff Holmes/Getty Images)

PAISLEY, SCOTLAND - JULY 01: Michael Duffy of Celtic in action against Den Bosch  during the Pre Season Friendly between Celtic and De Bosch at St Mirren Park on  July 01, 2015 in Paisley, Scotland.  (Photo by Jeff Holmes/Getty Images)