Chelsea Supporters' Trust has asked the Premier League to "act and investigate" co-owner Todd Boehly's involvement in ticket reselling website Vivid Seats.
In an open letter to the league's chief executive Richard Masters, the group reiterates a past complaint that Boehly's involvement in Vivid Seats as a director and investor - while also owning a 13% stake in Chelsea - is a "breach of trust" and "a clear conflict of interest".
It also highlights how Vivid is listed as an 'unauthorised ticketing website' by the Premier League, allowing overseas fans to buy tickets unofficially for between £90 and £20,000.