Barry Ferguson has warned Ange Postecoglou he can't be prepared for the heat of derby battle - but admits it's a shame there will be no Celtic fans present.
The Parkhead boss faces his first Old Firm game on Sunday as he takes his troops to Ibrox for the first Premiership meeting of the season.
The former Rangers captain has been impressed with the Celtic boss, who has named the Glasgow derby as one of the world's biggest fixtures.
But Ferguson insists it's the most keenly felt game on the planet as he warned Postecoglou there's nothing that will prepare him for the cauldron of Ibrox.
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