Hibernian have sent Tim Clancy to a specialist for assessment of his troublesome groin injury, with surgery a possible option for the defender.
Clancy has missed four of the last five matches, his only appearance in that time coming at former club Motherwell, when he was substituted midway through the second half. The 28-year-old has now travelled south for an expert opinion on his route to a return.
Hibs manager Pat Fenlon said: "We've rested him on the advice of the physios. It's improved it, but it hasn't improved it enough. It's a deep-rooted muscle, rather than a main groin muscle so difficult to treat because it is so deep. That's why we've sent him away to a specialist."
Fenlon added: "There's a few options in relation to the injury he has, so we want to make sure we take the right option.
"There's rest, there's surgery, there's an injection. We've rested him a little bit now and there has been an improvement, but dramatic improvement, we need to look at other options."
Clancy is out and Hibs captain James McPake (back) is again doubtful for Saturday's Clydesdale Bank Premier League clash with Aberdeen, when Fenlon's men will bid to extend their unbeaten run at home this term.
Key to the run and Hibs' present position in second place in the SPL has been the performance of top-scorer Leigh Griffiths.
Fenlon has no update on whether Hibs will be able to retain Wolves striker Griffiths, left-sided Manchester City defender Ryan McGivern and Motagua midfielder Jorge Claros beyond their current loan spells, which end in January.
"We're working away to hold on to our better players," Fenlon added. "When we have any news, whether it's good or bad, we'll let the supporters know as quick as possible."