Rangers captain Steven Davis could be forced out for the rest of the campaign because of a groin injury.
The 27-year old midfielder sustained the problem just over a week ago against St Mirren and will not play against Heart of Midlothian this weekend with a specialist to run the rule over him before making a decision on whether to have surgery or not.
"When he gets that done will be decided after a chat with the medical staff, but he won't be involved at the weekend, that's for sure.
"Missing our remaining games is a possibility and that's a concern, but he's going to see a specialist.
"It's certainly calmed down a lot since he came off in the game against St Mirren.
"It's still a niggle for him, but we'll know more once he's seen the specialist.""Davo is struggling a little bit. It's not been confirmed yet in terms of the extent of the injury, but it looks like he'll probably need a wee operation towards the end of the season," 'Gers manager Ally McCoist told the club's official website.