Hull City have been fined £30,000 over discriminatory chanting during an FA Cup game against Chelsea earlier this year.
The Football Association charge relates to homophobic chanting during their 4-0 defeat to the London side in February.
The club have also been issued with an action plan by the independent regulatory commission.
In a statement, the club warned their fans not to engage in further discriminatory chanting during their Premier League match against Chelsea at Stamford Bridge on Saturday.
The club said: “Hull City condemns, in the strongest possible terms, the offensive and inappropriate language used by the supporters responsible. The ‘rent boy’ chant in question is recognised as a homophobic slur and its use may constitute a hate crime.
“Three supporters identified as having engaged in homophobic chanting have been banned by the club for a minimum of three years. Individuals found using this chant may be arrested and face criminal charges.
“Ahead of Saturday’s trip to Stamford Bridge, the club reminds all supporters that discrimination of any kind is wholly unacceptable and will not be tolerated.”
Earlier on Friday, Hull confirmed winger Sorba Thomas was unhurt after flipping his vehicle near the club’s training ground.
Images on social media showed a Land Rover Defender with a personalised registration lying upside down beside a narrow residential street.
Eyewitnesses said the incident occurred around 9am, with fire engines and police attending the scene.
Pictures online also showed Hull boss Sergej Jakirovic at the site.
The Premier League club verified Wales international Thomas was driving, but stated he is "totally unscathed" and will travel with the rest of the squad for their match against Chelsea on Saturday.
A statement from the club read: "Hull City is relieved to confirm that Sorba Thomas is unharmed following a road traffic accident near to the club’s Cottingham training ground.
"The club is aware of images of Sorba’s car circulating on social media and can reassure supporters that he has sustained no injuries and emerged from his vehicle completely unscathed."
The Tigers are yet to concede a single goal since returning to the Premier League, having beaten Manchester United and Coventry before drawing with Aston Villa last week.
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