MONTREUX, Switzerland — Players at the 12 clubs setting up their own Super League could be banned from this year’s European Championship and next year’s World Cup, UEFA President Aleksander Ceferin said Monday.

Ceferin showed his sense of anger and betrayal by the leaders of some wealthy European clubs as he spoke of “snakes,” and wished UEFA could ban Super League clubs and players “as soon as possible” from all of its competitions.

Whether UEFA’s lawyers will advise that — with the Champions League and Europa League semifinals starting next week, and Euro 2020 kicking off in June — is unclear.

Ceferin spoke following a UEFA executive committee meeting and said some “legal assessments” will begin Tuesday morning. The meeting was held only hours after the English, Italian and Spanish clubs announced the Super League project that threatens to split the historic structure of European soccer.

“They will not be able to represent their national teams at any matches,” Ceferin earlier warned. “UEFA and the footballing world stand united against the disgraceful self-serving proposal we have seen in last 24 hours from a select few clubs in Europe that are fueled purely by greed above all else.”

UEFA’s 55 member federations are gathering for an annual meeting Tuesday, including 24 nations that are playing in Euro 2020.

Three of the 12 rebels — Chelsea, Manchester City and Real Madrid — are scheduled to play in the Champions League semifinals next week. Two more, Manchester United and Arsenal, are in the Europa League semifinals.

Earlier, the 12 planning to start the breakaway Super League told the leaders of FIFA and UEFA that they have begun legal action aimed at fending off threats to block the competition.

The letter was sent by the group to Ceferin and FIFA President Gianni Infantino saying the Super League has already been underwritten by funding of $5.5 billion from JPMorgan Chase.

Currently, teams have to qualify each year for the Champions League through their domestic leagues, but the Super League would lock in 15 places every season for the founding members. The seismic move to shake up the sport is partly engineered by the American owners of Arsenal, Liverpool and Manchester United, who also run franchises in closed U.S. leagues — a model they are trying to replicate in Europe.

UEFA warned the Super League clubs, including Barcelona and Juventus, that legal action would be taken against them and said they also would be barred from existing domestic competitions like the Spanish league and the Premier League.

“We are concerned that FIFA and UEFA may respond to this invitation letter by seeking to take punitive measures to exclude any participating club or player from their respective competitions,” the Super League clubs wrote to Infantino and Ceferin in a letter obtained by The AP.

“Your formal statement does, however, compel us to take protective steps to secure ourselves against such an adverse reaction, which would not only jeopardize the funding commitment, ... but would be unlawful. For this reason, SLCo (Super League Company) has filed a motion before the relevant courts in order to ensure the seamless establishment and operation of the Competition in accordance with applicable laws.”

The courts weren’t named.

The Super League intends to launch a 20-team competition with 15 founding members but only 12 have currently signed up. The others are Liverpool and Tottenham from England, Atletico Madrid from Spain, and AC Milan and Inter Milan from Italy.