Aston Villa Supporters' Trust say they are "highly disappointed" after the club announced a sponsorship deal with an online betting firm.
The club have signed a three-year partnership with Asia-based BK8.
Premier League clubs agreed in April to withdraw gambling sponsorships from the front of their matchday shirts by the end of the 2025-26 season.
The Trust said Villa had not listened to "legitimate concerns about gambling sponsorship in sports".
The deal with BK8 runs until the end of the 2025-26 campaign.
In January, Villa's fan consultation group met with then-chief executive Christian Purslow after the club had reportedly signed a deal with BK8.