McCoist has questioned that tactic and also suggested his old side needed to do more to help out their forwards.
"I thought it was a little strange, especially when you have two forwards on the pitch," McCoist told The Herald.
"If he could have got away with it, Walter Smith would’ve tried to sneak substitutes on at the posts when we were defending set-pieces but you do need to have an out ball.
"However, we didn’t get up the park at all, even with the front men out there.
Rangers news: 'Strange' tactic Steven Gerrard used vs Celtic questioned by Ally McCoist (Image: GETTY)
"The gap between our defenders and our forwards was too big.
"Then, instead of our defence pushing up to make the game tighter, the forwards actually came back to meet them and Rangers weren’t attacking Celtic at all."
McCoist has also claimed Celtic’s defence isn’t as strong as Brendan Rodgers would want it to be.
"Celtic haven’t looked too convincing defensively and I think Rangers gave them too much respect at the weekend, I really do," McCoist added.
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Rangers news: 'Strange' tactic Steven Gerrard used vs Celtic questioned by Ally McCoist (Image: GETTY)
"There was definitely an element of that because the teams which have had any success against Celtic recently have been bang at it and in their faces.
"I’ve seen that at Rugby Park [Kilmarnock] and Tynecastle [Hearts] and to have any chance of beating Celtic you have to play at a certain tempo.
"You need to show aggression – and by that I don’t mean kicking people.
"But you need to close people down aggressively and not give them time on the ball because that’s when Celtic look their most vulnerable.
Rangers news: 'Strange' tactic Steven Gerrard used vs Celtic questioned by Ally McCoist (Image: GETTY)
Rangers news: 'Strange' tactic Steven Gerrard used vs Celtic questioned by Ally McCoist (Image: GETTY)
"I don’t think they’re great defensively but you have to get at them to prove that and Rangers didn’t do it on Sunday."
Rangers now face a wait for their next fixture due to the international break.
They return to Scottish Premiership action when they host Dundee a week on Saturday.
They follow up that clash with a Europa League trip to Villarreal the following Thursday.