Rangers boss Ally McCoist insists Sone Aluko is not a diver after he was booked for simulation in the win at Motherwell.
Aluko went to ground under pressure from goalkeeper Darren Randolph in the box, with television footage showing contact was made.
But, rather than earn his side a penalty, Aluko was cautioned by referee Iain Brines, leaving him walking a disciplinary tightrope for the remainder of the match.
McCoist was unhappy with the decision and has called for a change to the rules which prevent clubs from appealing yellow cards.
"It's something that has to be looked at, because the same thing could have happened in the second half and he's off and you've not even got the right of appeal," said McCoist.
"You can't appeal one booking or another booking or the sending-off for maybe three wrong decisions, effectively. That's a problem and I think we have to look at that.
"I'm not having a go at the referee - I'm just having a go at the ruling. He is telling me that he didn't dive, that there was contact, which I believe."
McCoist claims he heard the impact of contact being made, as well as witnessing it.
He added: "I promise you I did - I actually did hear it and that's why I thought it was a penalty."
McCoist welcomed the opportunity to discuss the incident with the match official after the game but does not want his player branded a diver.
Aluko was handed a retrospective two-match ban for simulation earlier in the season after winning a penalty in a 2-1 win over Dunfermline in December.
"I went to see Iain after the game and he was great," continued McCoist. "He let me into the office and we had a wee chat.
"He thought it was simulation and I can totally understand that but I was disappointed not to get the penalty because I thought it was a penalty.
"Sometimes you get them, sometimes you don't, which I totally accept. But I don't think the kid deserved to get booked.
"It was the player I felt sorry for more than anything because I don't want him portrayed as one of those players that he is not."