Plans for a breakaway European Super League have been slammed by the European Club Association - the body of which Andrea Agnelli is chairman.
The Juventus president had been pushing for Champions League reform, with proposals to be voted on at the executive committee meeting on Monday.
But it emerged on Sunday that his club was one of 12 to have signed up to a proposal to break away and form a closed shop 'Super League'.
The brainchild of Real Madrid chief Florentino Perez, former Barcelona president Josep Bartomeu announced on his departure that the Catalans had signed up.
Manchester United, Liverpool, Manchester City, Arsenal, Chelsea and Tottenham are also on board, as are Atletico Madrid, Inter and Milan.
But the ECA, a group representing over 200 clubs including Rangers and Celtic, has announced that it does not support the plans.
It's believed a meeting was held on Sunday evening - and did not include chairman Agnelli.
The statement said: "In light of today's reports on the subject of a so-called breakaway league, the ECA as the body representing 246 league clubs across Europe, reiterates its shared commitment to working on developing the UEFA club competitions with UEFA for the cycle beginning 2024 and that a 'closed super league model' to which media articles refer would be strongly opposed by the ECA."
Leading figures both inside football and out have spoken out against the plans.
UK Prime Minister Boris Johnson said: "Plans for a European Super League would be very damaging for football and we support football authorities in taking action.
"They would strike at the heart of the domestic game, and will concern fans across the country.
"The clubs involved must answer to their fans and the wider footballing community before taking any further steps."
And Manchester United's legendary manager Sir Alex Ferguson has also slammed the plans.
He told Reuters: "Talk of a Super League is a move away from 70 years of European club football. Both as a player for a provincial team Dunfermline in the 60s and as a manager at Aberdeen winning the European Cup Winners’ Cup, for a small provincial club in Scotland it was like climbing Mount Everest.
"Everton are spending £500 million to build a new stadium with the ambition to play in Champions League. Fans all over love the competition as it is
"In my time at United, we played in four Champions League finals and they were always the most special of nights."
No French side has signed up with the French FA also coming out against the plans.
A statement said: "The FFF and the FLP oppose the whole project relating to the European Super League. Alongside UEFA, the FFF and FLP are positioned firmly against a project that threatens the entire pyramid of European football.
"The hegemonic dreams of an oligarchy will result in the disappearance of a European system that has allowed football to develop in an unprecedented way in Europe.
"By breaking this balance, the Super League project will put an end to a system based on sporting merit and which has been able to put in place mechanisms of solidarity with all the European federations."