Dundee United striker Johnny Russell is in contention to start against St Johnstone following his recent broken leg.
But United are without suspended full-back Barry Douglas, who lost his appeal over the red card he received in the 1-0 defeat against Ross County last week.
Midfielder Richie Ryan and defender Keith Watson are struggling with knocks while Gavin Gunning remains out of action due to a knee injury.
St Johnstone boss Steve Lomas is sweating on two of his midfielders when he takes his squad to Tannadice on Saturday.
The Europa League hopefuls may have to do without on-loan Newcastle youth Mehdi Abeid due to a thigh strain, while Irishman Patrick Cregg is struggling after jarring his knee.
But Murray Davidson has recovered from an ankle knock and returns to the Saints squad after missing last week's 1-0 victory Inverness Caley last week.
