Referees' union Prospect has demanded that Chelsea should apologise to Mark Clattenburg and compensate him after he was cleared of making a racist remark.
The Blues claimed Clattenburg used inappropriate language towards their midfielder John Obi Mikel.
The Football Association (FA) has now cleared Clattenburg and Chelsea has also accepted the decision.
Prospect chief Alan Leighton called for a full and unreserved apology and compensation for loss of earnings, damage to reputation and stress.
Leighton, the national secretary of the union, also called on Chelsea to make a sizeable donation to anti-discrimination bodies Show Racism The Red Card and Kick It Out.
The FA has charged the Chelsea midfielder with misconduct following his involvement in an incident in the referee's room after the match between Chelsea and Manchester United in October.
Leighton believes Chelsea were right to investigate the claim but should not have made the issue public.
"The charge was based on the flimsiest evidence that should never have got to this stage. It should never have been made public and should have been dealt with confidentially," the BBC quoted Leighton, as saying.
"We are not criticising Chelsea because they investigated the complaint - they had a duty of care. What has happened over the last few weeks should not overshadow the fact the on-pitch relationship between match officials, players and managers is the best we've ever known it," he added.
"Rather the evidence consisted of just one statement and that is why they shouldn't have gone public," he said. (ANI)