Cuellar has been sidelined for three weeks with a hamstring injury suffered in the 1-1 draw at Blackpool.
But his availability for the meeting with Mick McCarthy's side could not be better timed.
Richard Dunne (dislocated shoulder) and Ciaran Clark (suspended) are definitely out while doubts remain over James Collins (calf) and Luke Young (knee).
Cuellar said: "It's been frustrating because I have been out injured for some time. I've really wanted to help but not been able to.
"But the most important thing is I am fit, feel really good and I am ready to go. I am 100% fit now and raring to play."
Source: PA
Source: PA