Real Madrid, Barcelona, and Juventus have all expressed support for the planned European Super League split.
Last month, twelve of Europe's top clubs revealed plans to create a 'Super League' to replace the Champions League, with 15 clubs guaranteed entry every year regardless of performance and just five spots available on merit.
However, supporters, administrators, and players were outraged by the controversial proposals, and the Super League collapsed within 48 hours of its launch, with all six English clubs withdrawing.
The nine clubs that have since withdrawn from the Super League - Manchester United, Liverpool, Chelsea, Arsenal, Manchester City, Tottenham Hotspur, Atletico Madrid, AC Milan, and Inter Milan - have received lenient bans from UEFA, although the three clubs that have yet to renounce the breakaway have been threatened with further action.
The remaining three clubs have challenged Uefa's conduct after they stated in the aftermath of the Super League's demise that "we are confident our plan is completely compliant with European law and regulations, as shown today by a court decision to shield the Super League from third-party actions."
A statement from the three clubs read: “The founding clubs have suffered, and continue to suffer, unacceptable third-party pressures, threats, and offenses to abandon the project and therefore desist from their right and duty to provide solutions to the football ecosystem via concrete proposals and constructive dialogue.
“This is intolerable under the rule of law and Tribunals have already ruled in favor of the Super League proposal, ordering Fifa and Uefa to, either directly or through their affiliated bodies, refrain from taking any action which may hinder this initiative in any way while court proceedings are pending.”
The statement continued: “We are fully aware of the diversity of reactions to the Super League initiative and, consequently, of the need to reflect on the reasons for some of them. We are ready to reconsider the proposed approach, as necessary.
“However, we would be highly irresponsible if, being aware of the needs and systemic crisis in the football sector, which led us to announce the Super League, we abandoned such mission to provide effective and sustainable answers to the existential questions that threaten the football industry.
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“We regret to see that our friends and founding partners of the Super League project have now found themselves in such inconsistent and contradictory position when signing a number of commitments to Uefa yesterday.
“However, given that the material issues that led the 12 founding clubs to announce the Super League weeks ago have not gone away, we reiterate that, to honor our history, to comply with our obligations towards our stakeholders and fans, for the good of football and for the financial sustainability of the sector, we have the duty to act in a responsible manner and persevere in the pursuit of adequate solutions, despite the unacceptable and ongoing pressures and threats received from Uefa.
“Mostly, we reiterate to Fifa, Uefa and all football stakeholders, as we have done on several occasions since the announcement of the Super League, our commitment and firm will to discuss, with respect and without intolerable pressure and in accordance with the rule of law, the most appropriate solutions for the sustainability of the whole football family.”