Willie Collum ref watch as Rangers and Celtic official has 5 big derby calls put under the microscope

It has been a title race full of high drama and when the Premiership top two face off you know there will be plenty more to come.

Celtic extended their lead at the top of the table over Rangers in a highly-charged showdown at Ibrox.

The battle for the title has been so tight between the Glasgow rivals this season, so there was understandably a sharp focus on every decision made by the referee.

Experienced whistler Willie Collum took charge of the clash and had his fair share of big calls in Govan.

He has been the man in the middle many a time when these two Glasgow heavyweights have gone head-to-head, but the significance to the title race added extra pressure on his shoulders.

Record Sport runs the rule over Collum's big calls on a day of frenzied drama in Govan.

With Rangers looking to reclaim their lead after Tom Rogic's equaliser, there were loud claims from the home crowd of a foul on Joe Aribo in the box from Carl Starfelt.

The Nigeria midfielder collected the ball in the box and the Celtic centre-back clipped the Rangers man as he changed direction.

The contact appeared to be inadvertent from Swede and the penalty claim was waved away by Willie Collum.

Verdict: Not a penalty.

Ahead of Cameron Carter-Vickers' winner, Daizen Maeda burst into the Rangers penalty box and shrugged off the home defence.

Allan McGregor rushed out of his goal and narrowed the angle as Maeda looked to pull the trigger.

The striker collapsed under the challenge of the veteran stopper before the ball flew in the opposite direction.

But IFAB rules state a penalty kick is only awarded if the foul is "considered by the referee to be careless, reckless or using excessive force."

In this instance it appeared like both players had nowhere