George Salmond will referee Sunday’s match between Celtic and St Johnstone.
Salmond has only refereed one other Celtic match this season, the 2-1 victory over Kilmarnock on Boxing Day, and was in charge of the Hibs v Dundee United match on Saturday.
Rangers away match at Motherwell will be refereed by Craig Thomson.
Calum Murray, who refereed the Rangers v Celtic match yesterday, will be the fourth official at the St Mirren v Kilmarnock match.
Celtic’s u-19 side can take a massive step towards clinching the title for the third season running when they face Dunfermline at Stirling University tomorrow, kick-off 1pm.
A win would lift John Kennedy’s side a point ahead of Hearts who have only one game left to play- away to Hibs on Saturday.
Celtic face St Mirren in the semi-final of the SFA Youth Cup on Sunday before facing Rangers at home and away and Hibs at home in their remaining SPL fixtures.
CLICK HERE for referee Conroy finally admits to Lafferty mistake
CLICK HERE for Lennon: Referee deprived me of doing my job
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