French midfielder Eric Skora limped out of training yesterday and there are fears he has torn his hamstring and could be out of action for up to six weeks.
Killie physio Alex MacQueen is working on Skora and the full extent of the damage will be known this week.
Rhian Dodds limped off during the first half of the 2-0 defeat against Rangers at the weekend and the midfielder will see a specialist.
He has suffered hernia problems over the past two seasons and boss Jim Jefferies fears a recurrence.
Defender David Lilley was forced to withdraw from the squad before the Ibrox clash with a hamstring injury in and faces weeks out.
Jefferies said: "Skora had been back in training but it looks as though he has torn a hamstring. The next 72 hours will determine whether he has or not.
"He is receiving treatment and we'll know once it settles down and he puts some ice on it whether it's torn or not.
"We're keeping our fingers crossed with that one. But if it's torn he could be out for a couple of months.
"We think Rhian may have another hernia. Alex is trying to check it out to see if it is as bad as that.
"We'll send him to see a specialist to find out the extent of his injury.
"David Lilley had to call off on Friday with a hamstring injury. It's difficult to say how long he'll be out because if he comes back too quickly he could tear it.
"We've not put a timescale on him but it will be a few weeks anyway. He's got no chance for Aberdeen this weekend."