Skipper Mackay is still struggling with a calf injury and midfielder Millar has a groin problem.
Midfielder Davidson picked up an ankle knock in Saturday's 1-0 defeat by Ross County in Dingwall, while Gary Miller (ankle), and Jamie Adams (back) remain sidelined.
Eurosport's Andreas Evagora examines the More »
Pitchside Europe - Fri, May 17, 2013 12:59 EDTMassimiliano Allegri's future as AC Milan coach More »
Pitchside Europe - Fri, May 17, 2013 12:48 EDTJim White has a sense of regret as he wonders why More »
Jim White - Fri, May 17, 2013 06:54 EDTOur experts from across Europe give their views More »
Pitchside Europe - Fri, May 17, 2013 04:04 EDTEarly Doors is in mourning but has pieced itself More »
Early Doors - Fri, May 17, 2013 02:12 EDT