Inverness Caledonian Thistle manager Craig Brewster has issued a stark warning to midfielder Ian Black.
Black is currently training with the club's under-19s after allegedly telling the manager he does not want to play for him at a team meeting.
He was subsequently left out of the squad which lost 4-3 to Aberdeen on Saturday and Brewster wants the 23-year-old to apologise, or he will continue to train with the youngsters.
But Black, who has a year left on his contract, may yet decide to move away rather than back down, with Aberdeen manager Jimmy Calderwood reported to be an admirer.
Brewster told The Press and Journal: "He did not even train with us last week and he is back training with our under-19s.
"He will be training with them until he decides to make an apology.
"There has not been a fall-out, but players cannot just go about saying things like Ian Black said and expect to get away with it.
"He knows what he has to do if he wants to get back into the squad.
"Ian has to realise he has to be part of the team and act accordingly.
"He does not just have to apologise to me, he has to apologise to the players in the dressing room.
"He has offended them as well and he knows what he has to do to get back in.
"It is not easy to manage 28 players, but it is my job and I have to do whatever is best for the dressing-room."
The dispute comes at the wrong time as the club have lost seven on the bounce in the league.