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.
Liverpool celebrate winning the 2005 European Cup Photo: PHOTOSPORT
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.
-BBC