Hearts boss Csaba Laszlo is livid with Marius Zaliukas after the defender's third sending-off of the season.
The 25-year-old Lithuanian has seen red three times in the last three months.
Laszlo told Hearts News: "I am very angry and disappointed with him, and definitely the player must think about his attitude.
"I can't understand that a player has three red cards in half a season. This is not okay. He may be young but he has international experience and has played a lot of games in the Scottish Premier League.
"He must have a different attitude. You can lose games - but you can't do what he did."
Laszlo added: "We have spoken internally about this.
"I have never had a player in my career who has had so many red cards - and I don't want to see anyone in my team do this in the future.
"If you don't have self-discipline then nobody can help you."