McCarthy's only absentee is striker Paul Taylor, who has been out since September with a foot injury.
Midfielder Jay Tabb opened the scoring against Sheffield Wednesday in his side's last outing and he is expected to retain his place in the side against Birmingham.
Patrick Kisnorbo could return to the starting XI. The defender has come off the bench in the Tractor Boys' last two games and he is in contention to be restored to McCarthy's team.
Winger Lee Martin is close to returning from an ankle injury, but he is unlikely to be ready in time to face the Blues.
Ipswich currently sit 14th in the npower Championship table, knowing a point on Saturday would be enough to ensure their safety.