Charlie Raglan has been added to the defensive injury list after picking up a hernia problem that will be operated on this week.
The 22-year-old has made 20 league appearance this season with the club's medical staff detecting the hernia injury recently.
Head of sports science and medicine, Rodger Wylde, explained the injury: "After discovering the problem we had to decide whether to operate on the area now and fix it or try to wait it out until later.
"We found that the injury was deteriorating and with fresh cover brought into the squad this week it was decided to go ahead with the procedure now.
"Post-op you would normally expect a four week recovery time and that's the prognosis for Charlie's injury."
Manager Danny Wilson also commented on the defensive sitiation, with Tom Anderson added to the squad on loan on Monday and fellow new signing Gary Liddle also able to play in the centre of defence if necessary.
Wilson said: "With the situation that has developed with Ian Evatt - who seems likely to be out for longer than we had hoped for - and also with Charlie Raglan having a hernia we were desperate to fill those gaps and thankfully we’ve been able to do that."