The Chelsea Supporters' Trust have demanded the resignation of chairman Bruce Buck.
The Trust have called for Buck and chief executive Guy Laurence to tender their resignations after the club withdrew from plans for a European Super League.
Chelsea fans held a protest against the Super League before their goalless draw at home to Brighton at Stamford Bridge, and were later seen celebrating once news of their withdrawal had filtered through.
In a statement, the Trust declared: "We request a full and in-depth explanation as to why the board took the decision to turn their back on the European competition and for CFC to explain why they signed up to the Super League without prior consultation with their loyal supporters.
"We are disappointed that an apology has not been included in the statement. The legacy of our club was put at risk for what appears to have been solely for financial gain.
"The CST presently have little or no confidence in our current leadership at board level. On Monday, Bruce Buck extensively defended CFC's plan to remain in the Super League at a fans' forum meeting.
"Buck, alongside Laurence, appears to have given no consideration towards the loyal supporters, so their positions would seem untenable moving forward.
"Our relations with CFC will remain frayed until we have a better understanding of why this decision happened and we are assured that change and safeguards are put in place.
"The CST will not rest until we are comfortable that change and protections are put in place, because 116 years of history was jeopardised. This is our club and will remain our club."