Rangers icon Ally McCoist has told his former team they cannot afford to lose to Celtic when the pair clash in their title blockbuster on Sunday.
The 59-year-old admits the big one is in his head four days before the great rivals lock horns at Ibrox.
McCoist was quizzed by radio co-host Laura Woods about his current thinking ahead of Ange Postecoglou 's league leaders taking on Rangers.
