Celtic striker Mohamed Bangura may need an operation on a knee problem.
Bangura has been out of action for three weeks and it was thought he would not need surgery.
But manager Neil Lennon has admitted the player has not responded well to treatment and an operation may be required to cure the problem.
The 22-year-old joined Celtic from AIK Stockholm in August and made nine appearances before being injured and he is yet to score for Celtic.
"At the minute he is doing okay but there hasn't been a rapid improvement and he might have to see a specialist," said Lennon.
Meanwhile, Lennon says the club may have to reconsider buying players from Asia after a club versus country row with South Korea.
Ki Sung-Yueng and Cha Du-Ri have both returned unfit from international duty and Lennon believes the help the club gives international sides is not always reciprocated.
"It is certainly something to consider, with the amount of travelling these guys do," he said.
"Ki wasn't well and we knew that. We had two doctors check him out and we knew he had a virus, although he didn't need a brain scan.
"They have to check them out and see for themselves, despite me having a top class medical team here.
"South Korea wanted him to go there and then travel to the Emirates and then to Lebanon when he clearly wasn't fit to travel let alone play.
"So he was in hospital for a week in Korea, came out and then went back in for a couple of days as he wasn't very feeling well and then flew back here.
"So he has been away for two weeks. For me it is time wasted when he could have been here with us looking after him.
"Cha has come back with a tight hamstring. He complained after the first game that it was tight and sore.
"I wouldn't say he was forced to play but he was taped up and played 90 minutes against Lebanon on Tuesday night and looks like he is not going to be able to play for us tomorrow [against Inverness].
"So it is very frustrating. We do all we can to help these countries but at times I don't think it is reciprocated."
Speaking at a media conference ahead of Saturday's trip to Inverness, Lennon reiterated his plea to fans to stop the chanting that has brought a Uefa charge against the club and also a Scottish Premier League investigation.
"I love this club and I don't want to see its name tarnished by, I have to say, a small minority of fans who aren't doing the club any favours," said the manager.
"I have to say that 99 per cent of our supporters are second to none, they have a fantastic reputation and they do themselves and the club credit, but it is something that is not doing us any favours, not just on the domestic stage but on the European stage.
"I would appeal to those people to just stop it now and add to the colour and atmosphere that they always do.
"It is important that the club's reputation is maintained."