Craig McLeish has named his starting lineup for tonight's William Hill Premiership Play-Off first leg.
Richard King, Jacob Devaney, Killian Phillips and Mikael Mandron come in as McLeish makes four changes from the side that drew 1-1 with Dundee United on Sunday.
Liam Donnelly misses out with injury, but Dan Nlundulu and Conor McMenamin return to the squad after injury. The pair take up a place on the bench.
Oisin Smyth and Fraser Taylor are unavailable for Partick Thistle as they are unable to play against their parent club.
St Mirren: Sinclair, Fraser, Gogic, Freckleton, King, O'Hara (c), Devaney, Campbell, Tanser, Phillips, Mandron
Subs: Tamosevicius, Richardson, McMenamin, Falconer, Idowu, Calvin, Nlundulu, Douglas, Young
Partick Thistle: Clarke, McPherson, Reading, Ashcroft, McBeth, Loughrey, Crawford, Chalmers, Fitzpatrick, Samuel, Watt
Subs: Budinauckas, Logan, Turner, Mackay-Steven, M.Falconer, Dolan, Lets'osa
Referee: Ryan Lee
VAR: Andrew Dallas
