Fuming Peter Grant insists referee Kevin Clancy should have said NO to a Celtic VAR check after Efe Ambrose's handball for Morton.
Ange Postecoglou's men cruised to Scottish Cup victory over the Championship side with both Kyogo Furuhashi and Aaron Mooy netting doubles, while David Turnbull marked his return to the starting line-up with a goal.
However, Celtic controversially took the lead at Parkhead when Cappielow centre-back Ambrose was adjudged to have handled the ball in the box after a lengthy VAR check.
Liel Abada's shot cannoned off the foot of Jack Baird in the penalty box, and hit the hand of Ambrose in the box on his return to Parkhead as he lunged to block the drive from the Celtic winger.
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