The former Aston Villa midfielder, who has not featured since their draw with Peterborough last month, is still struggling with a hamstring injury.
Fellow midfielder Luke Hyam missed last weekend's win at Bolton with a calf injury but could come back into contention to face the Lions.
Striker Michael Chopra, who scored a last-gasp winner at the Reebok, could be in line for a starting role having stolen all three points as a substitute.
Paul Taylor remains McCarthy's only long-term absentee as he continues to be sidelined by a foot injury.
The Tractor Boys are unbeaten in their last three league outings and could record three consecutive victories for the first time since February.