It has been a year since the European Super League was born and collapsed in a two-day soccer supernova of angry statements, legal threats and bad blood. But the project’s repercussions are far from over.

In a court filing this week in New York, a prominent American entrepreneur accused the president of European soccer’s governing body of “declaring war” on him to prevent him from organizing a series of exhibition games in North America featuring three teams — Real Madrid, Barcelona and Juventus — who remain committed to the idea of a breakaway European league.

The exchange between the promoter, Charlie Stillitano, and the president, Aleksander Ceferin, emerged as part of Stillitano’s employment dispute with Relevent Sports, an events and marketing company owned by the billionaire Miami Dolphins owner Stephen Ross.

Stillitano had been Relevent’s executive chairman until his departure last spring, when he left the company amid a dispute about a pandemic-related pay cut and a noncompete clause that Relevent had demanded.

In his lawsuit, Stillitano and his lawyers offered details of a text message he received in which they said Ceferin warned Stillitano that working with the three teams would effectively render him an opponent of UEFA, the governing body for European soccer that Ceferin leads.

The message, Stillitano said, came after he had texted Ceferin telling him that Relevent, which for a decade under Stillitano’s leadership had organized exhibition tournaments and games for top European clubs, had forbade him from working with any of the event company’s former clients. Stillitano asked Ceferin, whose organization is part of a partnership with Relevent, for a meeting, telling him that several teams “including the three that have caused issues with UEFA” had approached him to arrange games.

Those teams remain a toxic subject for many European soccer leaders. Real Madrid, Barcelona and Juventus have sued UEFA in Spain over the Super League failure — an action that forced UEFA to suspend disciplinary actions against the teams — and they are also trying to persuade European regulators that UEFA is abusing its monopoly position to block their efforts.

The implications of the court rulings could lead to a significant change in the decades-long organization of soccer in Europe, and to new legal fights: UEFA has insisted it will resume its efforts to punish the clubs once it has the legal right do so.

Ceferin reminded Stillitano of that in his reply.

“I have heard about your ‘business’ with the three clubs,” Ceferin said in the text message, which was included in Stillitano’s lawsuit. “Those clubs didn’t ‘cause issues with UEFA.’ They tried to destroy UEFA, football and me personally. It’s a shame that you don’t understand it. The fact that you work with them means that me, UEFA or anyone I can have influence on will not have any business or private relation with you until you’re on the other side.”

Stillitano’s lawyers described Ceferin’s message as “threatening.”

“It became clear that Ceferin and UEFA — and by extension their new partner, Relevent — were declaring war on Stillitano for considering an affiliation with the three teams,” the lawyers wrote.

UEFA recently negotiated a contract with Relevent, picking the company as a commercial partner to sell broadcast rights to competitions like the Champions League in North America. The organizations are also discussing the possibility of Relevent’s arranging an off-season competition that would be endorsed by UEFA.

In an interview on Friday, Ceferin said he was not interested in whether or not Stillitano worked with the three clubs. But the mere idea that he would, Ceferin said, was enough to end their relationship.

“When I realized that he is actually cooperating with them at the same time I decided to finish any relationship with him,” Ceferin said. He was more angered, he said, that a private text message had been disclosed in a public filing. “I never spoke with anyone about this because I have more important things to deal with that dealing with Stillitano,” Ceferin said. “By using the private correspondence publicly, Stillitano showed what his moral values are.”

The case is the latest example of ongoing bad blood between UEFA and the three teams, who are among the wealthiest and powerful in world soccer, and the peripheral damage that the Super League fight continues to cause. It has already destroyed the once-close relationship between Ceferin and the Juventus president Andrea Agnelli; the men have not spoken since last year, even though Ceferin is godfather to Agnelli’s youngest child. Now it is Stillitano who has been cut off.

For years, Stillitano moved easily among European soccer’s elite, building Relevent’s soccer business by using connections and friendships to arrange matches for top teams, strike multimillion-dollar deals and rub shoulders with legendary players and coaches. But he has for months been embroiled in a dispute with the company over payments and conditions related to his departure last May.

Stillitano contends that Relevent owes him about $1 million in salary and severance payments. Relevant has countered that it ended the payments only after Stillitano breached terms of a noncompete agreement by contacting its clients.

According to the lawsuit, Relevant had been paying Stillitano $650,000 a year until the pandemic, when, citing reduced revenues, it moved to reduce his base pay to $200,000. The company said Stillitano agreed to the reduction; Stillitano’s filing contends the pay cut was actually a deferment, and that he would be repaid at a later date.

But after Stillitano disputed the deferment, his relationship with the company deteriorated to the point that Relevent terminated his contract in May.

Stillitano had little choice but to find new work after that, his lawyers argued. He was “not a wealthy man,” they wrote in the filing, and was therefore required to work.