UEFA President Aleksander Ceferin has launched an incredible attack on several club chiefs, including Ed Woodward, labelling them "snakes" and "liars".
The 53-year-old was speaking after 12 founding clubs joined a European Super League, a competition which will oppose the newly reformed Champions League.
Six of those 12 came from the Premier League with Manchester United one of them. Italian giants Juventus are also members of the breakaway competition.
Andrea Agnelli, chairman of Juventus, was once a close ally of Ceferin and the UEFA chief is Godfather to his daughter.
Their relationship has been hugely damaged however and the UEFA President said: "I have seen many things in my life. I was a criminal lawyer. I have never seen people like that.
"If I start with Ed Woodward, he called me last Thursday evening saying he’s very satisfied with and fully supports the reforms & the only thing he want to talk about was FFP, when obviously he had already signed something else."
"Agnelli is the biggest disappointment of all."
He then took aim at the history of both United and Juventus by adding: "Things change. Juventus were in Serie B. Manchester United before Sir Alex Ferguson were I don't know where. Aston Villa was a big club. Why are they creating this? Because they are not managed right."
The European Super League has received widespread condemnation with football's authorities hitting out at the proposal.
Ceferin has also vowed that players who represent clubs who play in the Super League will be banned from playing in international tournaments.
“The players that play in the Super League will be banned from playing in the World Cup and Euros," he said. "We will take all the sanctions that we can."
He went on to say: "I cannot stress more strongly at the moment that UEFA and the football world stand together alongside this disgraceful, self-serving project from a select few clubs in Europe fuelled by greed above all else."
"This idea is a spit in the face of all football lovers and our society as well. We must not let them take it [football] away from us.
"Not only the football world, but society and governments are united. It's part of our culture. We are all united against this nonsense of a project.
"We have the English FA, Spanish Federation, Italian Federation, the Premier League. La Liga, Serie A and FIFA, unanimous in opposition to these cynical plans which are completely against what football should be.
"The greatest sport is based on open competition, integrity and sporting merit and we will never allow that to change."