Former referee Dermot Gallagher insists Willie Collum was RIGHT to book Odsonne Edouard for diving.

The retired Premier League whistler gave his opinion on Sky Sports after being asked to weigh in on the controversy from this weekend's 1-1 draw between rivals Celtic and Rangers. Edouard took a tumble inside the area under pressure from Borna Barisic, but rather than point to the spot, Collum booked the Frenchman for simulation.

Hoops captain Scott Brown was furious and claimed it was a 'stone-waller' at full-time while interim boss John Kennedy also believed it should have been a penalty.

But Gallagher sided with Collum and revealed Edouard had to be yellow carded as Barisic pulled out of the challenge. He said: "It’s not a penalty and when you see the angle he has to yellow card him.

“If the referee isn’t giving a penalty he has to book the player for diving. It’s difficult to tell but the referee has the best view, he’s looking at the player. That’s the referee’s view and the angle shows the knees buckling, if you like, which wouldn’t say it was a trip.

“I think, in defence of Edouard, he sees the contact coming and he anticipates it - but the defender pulls out."