Rangers boss Walter Smith is unsure whether Maurice Edu is facing a spell on the sidelines after injuring his knee against Hibernian.
The American midfielder took a blow to his knee in the 3-0 defeat on Wednesday and was replaced by half-time by loanee Vladimir Weiss.
Smith is crossing his fingers Edu can face Aberdeen, although it may be 24 hours before the club learn the full extent of the blow.
Full-back Sasa Papac also picked up a gash to his head, but Smith insists his injury was far more straightforward.
"Sasa Papac is fairly straightforward, he has 10 stitches above his eye," he continued.
"We don't know how bad Edu is. He has taken a knock on the knee but how bad it is we won't know for maybe a day or two."
Meanwhile, Smith believes fatigue played a major part in their shock home defeat to Colin Calderwood's men.
Smith believes their busy schedule has taken its toll, although he is shouldering the blame as he feels he could have changed the side around more and brought in fresh faces.
"You can always use tiredness but it's not an excuse," he continued. "You have to give credit to Hibs for the manner in which they played. That's the main aspect.
"Over the last four or five games, I've maybe asked too much of too many, I should maybe have changed the team around a little bit.
"We didn't have the required sharpness to break down a Hibs team who were playing exceptionally well.
"At the end of the day, we've got no complaints. Hibs played very well and worked very hard on the evening and deserved their win."