Adam Eckersley returns to the starting XI after serving a one match ban.
The left back replaces Stelios Demetriou who misses out today due to illness.
Saints are also boosted by the inclusion of Lewis Morgan, who returns from injury to take a place on the bench.
The Buddies are unbeaten in their last six league matches, picking up four wins and two draws in that time.
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St Mirren: O'Brien, Irvine, Baird, MacKenzie, Eckersley, Magennis, Mallan, McGinn, Smith, Loy, Sutton
Subs: Langfield, Gordon, Quinn, Storie, Fjelde, Todd, Morgan
