Glentoran have said that they will appeal against Gary Hamilton's goal-scoring appearance in Glenavon's 4-2 Irish Premiership win on Saturday.
Player-boss Hamilton was dismissed from the dugout in Glenavon's game against Linfield last weekend but was still ruled eligible to play at the Oval.
The Irish Football Association decreed that he had been sent off as a manager and not as a player.
However, Glentoran have indicated that they will contest this decision.
Hamilton scored two goals in Glenavon's win at the Oval as they fought back from 2-0 down to take the points.
"It's an open and shut case," Glentoran chairman Stephen Henderson told the Sunday Life.
"Based on the IFA disciplinary code, Mr Hamilton was a player in the game [against Linfield] and he should not have played today.
"We are putting in an appeal against the result."
However, Glenavon sought clarification on Hamilton's situation before Saturday's match and are confident that they have not breached any regulations.
Hamilton told the Sunday Life:"The report said that I was dismissed as a manager.
"I think the correct decision was made and if not, it is not fair on me and [Linfield player-manager] Warren Feeney.
"There has to be a situation where there is a distinction. You can't be guilty on two different things."