Despite a 2-0 victory at Fir Park, Martin O'Neill's side could have extended their lead further when Callum McGregor's shot was blocked by Lukas Fadinger.

The ball struck Fadinger's arm, but it was deemed not to be in an unnatural position at the time, thus not a punishable handball.

However, Collum believes Fadinger's arm was outstretched as he turned to block the shot and expressed disappointment that VAR did not highlight the incident.

He told Sky Sports' VAR Review Show: "Again, I've got great sympathy for the Motherwell player because I think he is trying to avoid the contact.

"As the shot comes in, he's turning his body away, he's bringing his leg up to block the ball.

"There's definitely discussion between the referee and the VAR about the arm tucked in.

"I think the elbow's tucked in, but the Motherwell player takes a real risk by his arm out from the body here.

"And in our opinion, after reviewing this incident, our coaching going forward is that this should be a penalty kick, should be awarded in this incident."

Collum also pointed out that the proximity of the shot was not close enough to exonerate Fadinger.

He added: "I don't think it's very, very close.

"If we're saying that we can award a penalty kick for the Milne incident, then we also need to consider this.

"But to be very clear and transparent, our coaching going forward here is that if this is not identified on the field, we expect a penalty kick to be awarded after the referee goes to the monitor."

Collum's remarks indicate a change in the approach towards similar incidents in future matches, with referees advised to penalise such instances.