UEFA has begun disciplinary proceedings against Real Madrid, Barcelona and Juventus, over their attempts to create a breakaway Super League.
The European football governing body confirmed this in a statement on Tuesday.
The clubs are the only three left of the initial 12, that have refused to distance themselves from the Super League following an outpouring of criticism.
UEFA said: “Following an investigation conducted by UEFA Ethics and Disciplinary Inspectors in connection with the so-called ‘Super League’ project, disciplinary proceedings have been opened against Real Madrid, Barcelona and Juventus FC for a potential violation of UEFA’s legal framework.
“Further information will be made available in due course.”
UEFA president, Aleksander Ceferin, warned the clubs in April, that “if they say we are a Super League, then they don’t play Champions League, of course.”