Celtic will be hoping to wrap up three Boxing Day points in Perth after their midweek slip up against St Mirren. The surprise stalemate in Paisley has left them trailing rivals Rangers by six points at the top of the Scottish Premiership.
And they can't afford too many more games like that if Ange Postecoglou has serious aspirations of winning the title in his first season in charge.
Callum Davidson has his own problems at the other end of the table with last season's domestic double cup winners on a wretched run.Celtic inflicted defeat on Saints in the Premier Sports Cup semi-final at Hampden in November and that was the first of a staggering seven defeats on the spin.
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