Ange Postecoglou insists Celtic must produce their best performance of the season to roar past Giovanni van Bronckhorst’s Rangers Euro stars.
The Celtic boss – who will be without crocked striker Giorgos Giakoumakis for Sunday's Scottish Cup semi-final clash at Hampden – is not banking on the Light Blues being bust after their Europa League heroics against Braga.
Postecoglou reckons Rangers will be boosted by bagging a last-four berth and it will be up to his men to rise to the challenge as they look to take a huge leap towards a domestic clean sweep.
