Murray Davidson has been given a 50-50 chance of being passed fit for St Johnstone's Scottish Premier League game against Kilmarnock.
Davidson suffered a torn ankle ligament in the Co-operative Insurance Cup tie against Celtic but could yet make the squad for tomorrow's game.
However, Danny Grainger is suspended and will miss the visit of the Ayrshire club.
Kilmarnock again have an unchanged squad for the clash.
Long-term injury absentees James Dayton and Alan Combe remain on the sidelines.
Combe is several weeks away from returning after double hernia surgery while Dayton is making good progress following a cruciate ligament injury and is working towards a March comeback.
St Johnstone (from): Smith, Maybury, Duberry, MacKay, Craig, Millar, MacDonald, Samuel, Myrie-Williams, Rutkiewicz, Milne, Parkin, Haber, Enckelman, Jackson, May, Caddis, Davidson.
Killie (from): Bell, Sissoko, Gordon, Wright, Hamill, Bryson, Pascali, Silva, Invincibile, Kelly, Eremenko, Forrester, Rui Miguel, Sammon, Clancy, Letheren, Hay, Taouil.