Inverness Caledonian Thistle manager Terry Butcher fears defender Chris Hogg could be out for the rest of the season through injury.
Hogg went off injured after 15 minutes of the 3-2 defeat by Dundee United, while David Davis was sent off late on.
"We've lost a player for next week, we've lost a player for what could well be the rest of the season and we've lost three points," said Butcher.
Butcher was critical of his players for squandering a 2-0 lead.
"I find it hard to believe what happened," he told BBC Scotland. "We have caved in, there's no doubt about that.
"We've allowed three goals to go in that really were very poor defensively.
"We've had opportunities at the other end but haven't put them in. I'm in total disbelief, really.
"Players were missing passes, miscontrolling the ball and giving it away, defending poorly.
"It's one of those games where you'll keep looking at it and looking at it and saying, how did we lose that?"
"It's been a disaster day because it looks as though Chris Hogg's knee is gone.
"That's a horrific blow for him and us."