St Mirren striker Craig Dargo is to see a specialist to diagnose his mystery knee problem.
The Buddies marksman has been sidelined since scoring the winner against Hibernian in August.
The 32-year-old is worried by his condition and hopes a scan will be able to get to the root of the problem.
"I wonder what's wrong because I can't train and usually a scan reveals the nature of the problem," explained Dargo.
"But they've been unable to say what it is and that's the worst part.
"I may have tweaked a medial ligament but it just hasn't shown up. It could also be a cartilage problem."