St Johnstone striker Francisco Sandaza is "touch and go" for the game.
The Spaniard missed last weekend's win over Hearts with a thigh injury and will be given until the last moment to prove his fitness.
His strike partner Cillian Sheridan (hamstring) remains out, together with Jody Morris (hamstring) and Frazer Wright (thigh).
Keith Lasley will return for the Motherwell.
The midfielder missed last Friday's abandoned clash with Hibernian with a thigh strain but has trained without problem over the last two days.
Steven Saunders remains on the long-term injury list with an Achilles problem.
St Johnstone (from): Enckelman, C Davidson, Maybury, Mackay, Anderson, McCracken, Gibson, Craig, Moon, Millar, Sandaza, Haber, Mannus, M Davidson, Finnigan, Parkin, Adams, Higgins.
Motherwell (from): Randolph, Hateley, Hammell, Craigan, Hutchinson, Law,
Jennings, Humphrey, Murphy, Higdon, Daley, Hughes, Forbes, Carswell, McHugh, Clancy, Lasley, Bradley.