Chris Sutton has accused referee John Beaton of "not understanding the laws" after he chopped off Celtic's second goal against Dundee United.
The Parkhead side scored early through Callum McGregor in the Scottish Cup tie and thought they had a second later in the first half when Daizen Maeda tapped home.
But play was pulled back for a perceived handball by Giorgos Giakoumakis with the home side given a free-kick.