Celtic midfielder Joe Ledley fears his season could be over after injuring his hamstring in Sunday's draw at Rangers.
Ledley, who passed a late fitness test to start against Rangers, suffered a recurrence of the problem during the goalless draw at Ibrox.
The Wales international is working round the clock in a bid to regain fitness, but he fears he could miss the crucial climax to the campaign.
"All I've been doing is icing the leg since Sunday," said Ledley.
"It's been agony since I came off. I've never known anything like it. I can barely walk.
"I won't know anything until the results come back. I'm a quick healer so you never know. It's not looking good though judging by how it feels.
"It felt absolutely fine on Saturday, so obviously I wanted to play.
"I'll be gutted if I miss the run-in and the Cup final so I'm hoping for a quick recovery."