Uefa and the Premier League have strongly condemned 12 major European clubs, including the ‘big six’ from England, signing up to a breakaway European Super League.
Arsenal, Chelsea, Liverpool, Manchester City, Manchester United and Tottenham are part of the group.
La Liga’s Atletico Madrid, Barcelona and Real Madrid and Serie A’s AC Milan, Inter Milan and Juventus are involved.
Uefa said it will use “all measures” possible to stop the “cynical project”.
Senior figures at European football’s governing body are furious about the proposals.
None of the clubs involved have commented yet but it is thought a statement is likely to be released later on Sunday.
BBC Sport was told last week of plans for some sort of confirmation about a European Super League.
Uefa had hoped to head off plans with a new-look 36-team Champions League set to be confirmed on Monday.
The European governing body released a joint statement together with the English Football Association, Premier League, Spanish Football Federation (RFEF), La Liga, and the Italian Football Federation (FIGC) as well as Serie A, on Sunday.
They said they will “remain united” in trying to stop the breakaway, using both judicial and sporting measures if required.
They also reiterated Fifa’s stance that players taking part in the Super League would be banned from all other competitions at domestic, European or world level and could be prevented from representing their national teams.
In a separate statement, the Premier League said it condemned the proposal as it “attacks the principles of open competition and sporting merit which are at the heart” of domestic and European football.
The UK government also criticised the plans, with Culture Secretary Oliver Dowden saying in a statement “we are concerned this plan could create a closed shop at the very top of our national game”.
He added: “We have a football pyramid where funds from the globally successful Premier League flow down the leagues and into local communities.
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