'Ally is 50-50,' Smith said. 'The injury is not really the problem, it's more because of the number of games he has missed over a period.'
Charlie Miller, 18, is also set to make his Old Firm debut, while Alan McLaren lines up in a Rangers jersey for the first time after his midweek move from Heart of Midlothian.
Celtic's injury worries stem from their extra time Coca- Cola Cup semi-final win on Wednesday. Their captain Paul McStay, who returned against Aberdeen after gashing his shin, now has a groin problem, while his midfield partner Peter Grant is also struggling with a foot injury.
Hearts and Hibernian contest the possibility of going top tonight depending on how Motherwell fare at home to Kilmarnock. Hearts have no injury worries with Jim Bett set to play in his first Edinburgh derby, while Dave McPherson is set to make his debut second time around.Reuse content