The Tractor Boys have won their last three games and picked up 16 points out of a possible 24 since the former Wolves boss arrived at Portman Road.
And McCarthy is boosted by the return of Reo-Coker, who missed the three wins with a hamstring problem, should McCarthy wish to make any changes in midfield.
But fellow midfielder Luke Hyam remains sidelined. After returning from a hamstring injury, Hyam was struck down with illness and will not make the trip.
Forward Tyrone Barnett is out for three months with a cruciate ligament injury picked up in training and has returned to parent club Peterborough for his rehabilitation.
Fellow striker Paul Taylor remains out with a foot injury.