Lee Miller could have played his last game for Carlisle after being left out of the squad for Tuesday's pivotal game at Crawley.
The 30-year-old Scot, out of contract in the summer, failed to attend a team meeting after last weekend's home defeat to Oldham and was axed by boss Graham Kavanagh for the goalless draw at Crawley, which leaves the Cumbrians on the brink of relegation.
Carlisle must win their last match at champions Wolves on Saturday and hope other results go their way in order to escape the drop.
"Lee decided he wanted to do his own thing on Saturday after the game," Kavanagh said after Tuesday night's disappointment.
"He said it was a misunderstanding, but there was him and another player who didn't turn up for the meeting.
"I took exception to that. There were 22 other players who sat and faced the music, and were very much in it to win it and wanted to come to Crawley.
"I felt that if that was the case, I only wanted players who were going to be committed.
"That's why I selected the squad I did. I'm not saying he has let the squad down - that's for everyone else to decide.
"It was a disciplinary matter which I have dealt with."
Kavanagh said he was undecided on whether to recall Miller for the Wolves game.
Fans favourite Miller was lauded by Kavanagh earlier this year after agreeing to waive a clause in his contract that would have guaranteed him a new deal.
Miller removed an appearance-based clause which would have assured him of another season at the club on the same wages.