Hearts owner Vladimir Romanov has transfer-listed Andy Webster after claiming he can no longer trust the defender.
Webster was dropped from the squad to face rivals Hibernian at the weekend and Romanov has now set up a summer exit by making the 24-year-old available for transfer.
The Tynecastle chief claims that Webster's agent Charlie Duddy has been trying to engineer a switch to UEFA Champions League rivals Rangers, and as a result Webster can no longer be relied on for the rest of the season.
"The coach is not sure Webster can give his 100 percent best to win more points for us," said Romanov.
"There have been statements in the media that Webster is looking for another club. I heard the name of Rangers among those he is supposedly looking at.
"I was told Webster's agent has made several statements to this effect. It means we can't be totally sure we can rely on the player.
"This situation is entirely the result of his agent's games which do not help the club or the player.
"The club should not work any more with agents like this because they start winding up the players.
"For the club, it means our only option is to put him on the transfer list."
Romanov also voiced his disappointment that the issue had reared its head with the season coming to a close, instead of during the January transfer window.
"I'm sad all this has emerged so late in the season," Romanov.
"If that was the agent's intention, why wasn't this made clear before the January transfer window and we could then have a fair and open discussion?
"No-one would have stood in Webster's way if that was his choice. Instead, it feels like an unfair game with the club and I am saddened by this.
"What I want at Hearts - just like our great fans - are players who are giving everything to the club, not those who are looking over their shoulders at Rangers, at a time when we are battling for the Champions League."