The SPFL say there is "insufficient evidence" to take action on allegations of racist abuse aimed at Dundee United's Jeando Fuchs.
The Cameroon midfielder had complained of hearing a racial slur at Tannadice during a game against Ross County.
The league body has examined findings from both clubs and reviewed the match delegate's report.
Ross County chief executive Steven Ferguson said his club and supporters had been "fully exonerated".
Ferguson's statement cited "extensive investigations" and declared that the authorities found "no evidence of racist language being used".
The allegation came after home players celebrated Ilmari Niskanen's winning goal for United on 2 October and, following the match, home head coach Thomas Courts held an anti-racism T-shirt in front of the visiting fans at Tannadice.
Ferguson said the Highland club were "extremely disappointed" at how they, their staff and supporters had been portrayed "in certain quarters".
He added: "Ross County FC sets very high standards in responsibly handling all concerns of hate crime. We would like to reiterate that any form of hate crime, including racism, has no place in society and must never be accepted in Scottish football.
"A large amount of clear and precise evidence from a significant number of witnesses and sources within the Ross County support and from personnel outwith our club was reviewed by various parties including Police Scotland. A report was then submitted to the SPFL and Scottish FA for their consideration.
"It was made clear from this evidence that absolutely no racist language had been used. The individual who had chanted also came forward during the investigation. His statement was corroborated by sources outwith Ross County that were in attendance."
Police Scotland say that since there was no formal complaint, there was no official investigation on their part and the SFA has confirmed it had no role in investigations.
On hearing of County's statement, United boss Courts said: "We have total respect for Ross County as a club, we have a total respect for their wider fan base.
"On that day we were standing up for a very strong allegation that was later corroborated."
When asked if he regretted his gesture with the T-shirt, he replied: "No, absolutely nothing at all."
A brief statement from the SPFL read: "After reviewing the match delegate's report and information provided by Ross County and Dundee United, the SPFL has concluded there is insufficient evidence for any action to be taken by the SPFL against Ross County on this matter."