Manchester United legend Eric Cantona has weighed in on the Super League proposals.
His former club are one of the dozen proposing a breakaway league, separate from the UEFA Champions League.
The plans have been met with derision from fans of the clubs involved, including high-profile supporters of United.
Cantona's former teammate Gary Neville lashed out at the role of United's owners in the Super League. He claimed the Glazers were "scavengers" who needed to be "booted out" of Old Trafford, and of English football.
Meanwhile, former Arsenal striker Ian Wright said players of the breakaway dozen are being jeopardised by the breakaway.
"I'm going to say something about the European Super League," Cantona said on Instagram.
"For one year, we have seen games on TV with the best clubs in the world, and the best players in the world, and it was so boring.
"And it's still so boring. Because the fans are not there.
"The fans singing, jumping, supporting their teams. So the fans are the most important thing in football. They have to be respected.
"Did these big clubs ask their fans what they thought about this idea? No, unfortunately. And that's a shame."
Cantona's protestations are likely to fall on deaf ears.
According to BBC News sports editor, Dan Roan, some Super League clubs some "call traditional supporters of clubs 'legacy fans' while they are focused instead on the 'fans of the future' who want superstar names.
*Big clubs from struggling leagues (Spain, Italy) agitating because their domination of has produced boring football outcomes.
*All hurting due to Covid. Want control of the competition structure and of revenue distributions.
— Dan Roan (@danroan) April 19, 2021
Ian Wright: “Shameful” Super League putting players in jeopardy