McMahon has recovered from a sprained ankle, the latest in a succession of injuries, and is expected to be included among the substitutes.
Manager David Weir must decide on who to fill the void left by departed midfielder Kevin McDonald, who joined Wolves this week for an undisclosed fee. Jamie Murphy was recalled at Brentford, but Callum McFadzean is also pushing for a start.
Weir, who has no new selection problems, could be tempted to recall striker Chris Porter, while wide midfielder Ryan Flynn is hoping to make his first league appearance of the season.
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