But as classy as the Aussie was, the night belonged to winger James Forrest who piled on four goals in the first half.

In a slick 69 minute shift at McDiarmid Park, Rogic linked up expertly with Forrest for two goals on 30 and 38 minutes to complete his hat-trick.

The Scot scored the opener on 15 minutes and rounded off the assault with another goal on the stroke of half time.

By the break Celtic were up 5-0 with Odsonne Edouard adding to The Saints pain on 22minutes and Callum McGregor completing the rout in the 84th minute.

The result puts the Hoops within three points of pace setters Hearts.