Jack Ross will hand debuts to new signings Adam Eckersley and Harry Davis against Dumbarton this afternoon.
The English duo signed for the Saints on transfer deadline day and come into the team along with newly promoted club captain, Stephen McGinn as does David Clarkson.
Last week's goalscorer Rory Loy misses the game through illness while Stephen Mallan is also out due to a injury. Pal Fjelde, Jack Baird and John Sutton drop to bench.
St Mirren: O'Brien, Irvine, MacKenzie, Davis, Eckersley, Magennis, McGinn, Storie, Smith, Morgan, Clarkson
St Mirren Subs: Langfield, Demetriou, Webster, Baird, Todd, Fjelde, Sutton
