UEFA president Aleksander Ceferin has threatened to ban the four teams who are yet to leave the European Super League from the Champions League.
There were 12 teams in the Super League when it was originally announced on Sunday, only for the plan to collapse over a 48-hour period as eight sides eventually pulled out.
But, Real Madrid, Barcelona, Juventus and AC Milan have not officially left the competition.
“It’s crystal clear that the clubs will have to decide if they are Super League or they are a European club,” Ceferin told The Associated Press.
“If they say we are a Super League, then they don’t play Champions League, of course … and if they are ready to do that, they can play in their own competition.
“For me, it’s a very different situation between the clubs that admitted their mistake and said, ‘We will leave the project.’ “The others mainly know I would say that this project is dead, but they don’t want to believe it, probably.”
Europe’s governing body met on Friday to discuss about the possibility of punishing the club officials involved in the Super League plan. Ceferin said that UEFA is planning on connecting with national federations and domestic leagues to discuss possible sanctions.
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In the meantime, UEFA is moving forward with its plan for a reformed Champions League starting in 2024. The tournament will expand from 32 clubs to 36, with group-stage matches increasing from six to 10.
The Champions League change has also proven unpopular, with Manchester City midfielder Ilkay Gundogan calling it “the lesser of the two evils” when compared to the European Super League.