Celtic hero John Hartson laughed off a Scottish Cup semi-final conspiracy theory floated by Alan Brazil - as he confessed Rangers can stun Ange Postecoglou's side.
Michael Beale will look to keep the Light Blues' hopes of lifting silverware this season alive at Hampden by ending Ange Postecogolou's dreams of a domestic clean sweep this season.
Celtic go into the showdown at the national stadium as favourites having already seen off Rangers in the Viaplay Cup final, while currently holding a convincing 13-point lead at the top of the Scottish Premiership.
However, former Parkhead striker Hartson admits he can see a route to victory for Rangers on Sunday after recent displays on derby day under Michael Beale - before diehard Celtic fan Brazil attempted to shut down the chat on the talkSPORT Breakfast Show.