Michael Paton (thigh) has joined fellow forward Tommy Wright (calf), defender Zander Diamond (Achilles) and goalkeeper Bertrand Bossu in the Dons' treatment room.
Mark McGhee must decide whether to field his strongest possible line-up with Aberdeen 5-1 down from last Thursday's first leg.
Kick-off is at 7pm BST.
Dons (from): Langfield, Vidal, Mulgrew, Considine, Pawlett, Duff, McDonald, Foster, Kerr, Aluko, Young, Miller, Mackie, Maguire, Nelson, Stewart, Ross, Crawford, Bateman, Holm, Megginson.
