Scott McDonald’s challenge on Dundee United’s Lee Wilkie on Tuesday night will go to the match review panel.
The incident occurred in Celtic’s 2-1 win over Dundee in the Scottish Premier League on Tuesday night and it is believed that most onlookers saw McDonald’s challenge but the most important person did not.
Referee Stuart Dougal was blindsided and saw nothing untoward despite the fact Wilkie remained on the ground after he had waved play on.
Then there was an altercation between Dougal and Dundee manager Craig Levein which heightened the drama.
Wilkie said he made mention of the incident to Dougal at half-time, despite saying McDonald’s tackle was unintentional but all he received was a silly remark.
"He caught me just below the knee but I don't think it was intentional," Wilkie said.
"I was waiting for the ref to stop the game but he waved play on and it looked like he wasn't going to let the physio on.
"I said to the referee at half-time, 'what were you playing at?' and he said, quite arrogantly, that his kids had had bigger knocks than that, which was a stupid comment to make - his kids must be some size.
"All he needed to say was that he thought I never got touched but he had to make a silly comment.
"It was my good knee, not my left knee, but I got a fright and he should have been aware of the problems with my knees.
"Referees want respect from players and they treat them in that way and that's what annoys us."