McDonald Suspended
The duo were sent off in Monday night's 4-1 defeat by Dunfermline and an appeal against McDonald's red card failed. Jim Paterson and David Murphy are injured.
St Mirren midfielder Richard Brittain is suspended, meaning he misses the relegation battle at Fir Park.
Also sidelined for the saints are Stephen O'Donnell and Craig Molloy, who are both still injured.
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