Manager Andy Scott lost goalkeeper Wojciech Szczesny, defenders Pim Balkestein and Karleigh Osborne and midfielder Marcus Bean to injuries during Tuesday night’s 2-2 draw.
Polish teenager Szczesny has returned to parent club Arsenal for treatment on an ankle injury and Ipswich loanee Balkestein is back at Portman Road after suffering a recurrence of his groin problem.
Nikki Bull took over in goal for his first appearance since undergoing shoulder surgery in October and is on standby.
Osborne is a doubt after going off with a dead leg and Bean will struggle to recover from a hamstring injury in time.
Skipper Kevin O’Connor (foot) and defenders Mark Phillips (knee) and Ryan Dickson (hamstring) remain on the sidelines.