The Rangers Supporters Trust are concerned about the SPL's unacceptable conduct policy when it comes to alleged sectarian chanting. The club's fans could be reported by SPL match delegate Alan Dick for some of the chants and songs that appeared to come from the away support during Sunday's goalless draw at Celtic.
"While it is difficult to comment until we've seen the report, we are looking forward to an even-handed and consistent approach to the application of this legislation," Edgar said.
"We find it hard to believe that Rangers fans are the only fans in the country who have ever sung an offensive song; yet we are the only ones who have been reported under the rules.
"There were instances of distasteful chanting coming from both ends on Sunday but, yet again, the focus is only on one set of fans.
"It therefore becomes very difficult for the supporters to understand what is going on.
"Are the rules genuinely in place to eradicate offensive chanting or simply to punish Rangers?
"We are committed to ridding Scottish football of all genuinely offensive chanting and Rangers fans have responded magnificently over the last couple of years.
"However, we are left with wondering if this is a rule for all the SPL clubs or are a rule simply for Rangers."