Referees' union Prospect have repeated their call that Chelsea should apologise to Mark Clattenburg and also pay him compensation.
Clattenburg will return to match action on Sunday, having been cleared of using "inappropriate language" towards Chelsea's John Obi Mikel during a match against Manchester United on 28 October.
And Prospect are unhappy that Chelsea pursued the case against Clattenburg, in light of the fact that just one player, Brazilian midfielder Ramires, heard the comment at the time.
Prospect national secretary Alan Leighton said: "Chelsea have done a number of things wrong with this case.
"Firstly, they made the allegation and the nature of it public on the Sunday of the match.
"Secondly, on the Wednesday after their detailed investigation they decided to go ahead with a formal complaint based on one single witness statement.
"The FA statement makes it clear Chelsea didn't even know when the alleged comment was supposed to have been made during the game. No organisation in the world would say that was ever going to get past the barrier of evidence needed to bring a charge.
"Thirdly, they have not apologised to Mark, who has gone through hell. This is about an individual who has been badly wronged and there is not even recognition about what they have done to this referee and that is staggering."
However, Leighton says Prospect do not intend to take Chelsea to court.
"That is not our intention at this moment," he added. "Our intention is for something to happen that avoids any need for legal action.
"We have been calling for Chelsea to make an apology and pay compensation because it's the right thing to do."