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GLASGOW, SCOTLAND - MARCH 06: Gary Mackay-Steven of Celtic celebrates with Kieran Tierney after he scores the second goal during the William Hill Scottish Cup Quarter Final match between Celtic and Greenock Morton at Celtic Park Stadium on March 6, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty images)

GLASGOW, SCOTLAND - MARCH 06: Gary Mackay-Steven of Celtic celebrates with Kieran Tierney after he scores the second goal during the William Hill Scottish Cup Quarter Final match between Celtic and Greenock Morton at Celtic Park Stadium on March 6, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty images)