St Johnstone have doubts over Steven Anderson and Collin Samuel for Saturday's Clydesdale Bank Premier League trip to Aberdeen.
Defender Anderson has a toe injury, while striker Samuel is struggling with a knock to the knee.
Stuart McCaffrey (groin), Steven Milne (ankle) and Euan McLean (ankle) are out.
Aberdeen manager Mark McGhee will be without several players.
Chris Maguire and Maurice Ross are both suspended following red cards during last week's 2-0 defeat to Hibernian.
Fraser Fyvie is also out after suffering ankle ligament damage during the game at Easter Road and will be out of action for a few weeks.
Zander Diamond remains on the sidelines with an ankle injury.
Teams:
Aberdeen (from): Langfield, Ifil, Considine, Mulgrew, McDonald, Foster, Kerr, Miller, Young, Duff, Wright, Paton, Crawford, Hansson, Bain, Mackie, Aluko.
St Johnstone (from): Smith, MacKay, Grainger, Anderson, Rutkiewicz, Gartland, Morris, Davidson, Hardie, Craig, Morais, Millar, Deuchar, Samuel, Johansson, Main, Reynolds, Kelly, Sheerin, Swankie.