From the OS
There are four changes to that Thistle side which downed the Perthshire Saints as Alan Archibald is forced into a few alterations. Conor Sammon misses the game due to a family bereavement and he is replaced by Kris Doolan. Callum Booth and Steven Lawless are also missing due to knocks. Mustapha Dumbuya comes in for Booth as Paul McGinn switches to the left-hand side while Ryan Edwards comes in for Steven Lawless. Adam Barton is the final change as he slots into a back three, replacing Chris Erskine to facilitate a change of formation.