Hearts are to appeal against the red card shown to Takis Fyssas in the 3-2 defeat by Celtic on New Year's Day.
The Greek defender was shown a straight red card by referee Ian Brines for a foul on Celtic forward Shaun Maloney.
"Having carried out a detailed review of the incident, Hearts will be appealing the decision," a statement issued by Hearts read.
"The club will be sending all related documentation to the SFA within the required three-day timescale."
One of Scotland's most respected former referees says Hearts have no basis for an appeal.
Willie Young, who retired at the end of last season, said: ''All the hallmarks are there of a sending off. Maloney is heading for goal and Fyssas attempts to bring him down.
"Ian Brines only has a split second to make a decision and he made the right one. Even the Hearts player seemed to accept it at the time.''
Hearts led 2-1 when Fyssas was dismissed with 14 minutes remaining.
Head coach Graham Rix questioned Brines' decision.
"I've just seen a replay and I'm not sure he touched the lad," he said.
"There are a few things the referee has to think about before he sends him off. But I got the impression he couldn't wait to send him off. It changed everything."