Saints had a fully-fit group for their 1-0 away win over Hamilton on Boxing Day.
Matty Kennedy could return to the team after staying on the bench during the game on Hamilton's artificial surface.
Midfielder Lewis Spence is suspended for Ross County after being sent off against Motherwell.
Forward Lee Erwin could return after missing the defeat by his former club through illness.
St Johnstone provisional squad: Clark, Duffy, Ralston, Tanser, Vihmann, Gordon, Kerr, Holt, Swanson, Craig, McCann, Wright, O'Halloran, Kane, May, Kennedy, Wotherspoon, Davidson, Hendry, Booth, Parish.
Ross County provisional squad: Baxter, Foster, Fraser, Kelly, Fontaine, Morris, Watson, Spittal, Paton, Chalmers, Mullin, Stewart, Reid, McKay, Graham, Erwin, Power, Henderson, Laidlaw.