UEFA has released a statement condemning the formation of a so-called European super league with the backing of the FA, the Premier League, the Royal Spanish Football Federation, La Liga, the Italian Football Federation and Serie A.
Reports emerged on Sunday suggesting five Premier League clubs had signed up for a new competition in Europe which would directly threaten the Champions League, for which new plans are expected to be announced formally on Monday.
Arsenal, Chelsea, Liverpool, Manchester United and Tottenham are said to be among 11 major European sides that have approved of a super league rather than a reformatted Champions League, and Europe's governing bodt has now responded.
UEFA's statement in full
"UEFA's statement reads: "UEFA, the English Football Association and the Premier League, the Royal Spanish Football Federation (RFEF) and LaLiga, and the Italian Football Federation (FIGC) and Lega Serie A have learned that a few English, Spanish and Italian clubs may be planning to announce their creation of a closed, so-called Super League.
"If this were to happen, we wish to reiterate that we – UEFA, the English FA, RFEF, FIGC, the Premier League, La Liga, Lega Serie A, but also FIFA and all our member associations - will remain united in our efforts to stop this cynical project, a project that is founded on the self-interest of a few clubs at a time when society needs solidarity more than ever.
"We will consider all measures available to us, at all levels, both judicial and sporting in order to prevent this happening. Football is based on open competitions and sporting merit; it cannot be any other way.
"As previously announced by FIFA and the six Federations, the clubs concerned will be banned from playing in any other competition at domestic, European or world level, and their players could be denied the opportunity to represent their national teams.
"We thank those clubs in other countries, especially the French and German clubs, who have refused to sign up to this. We call on all lovers of football, supporters and politicians, to join us in fighting against such a project if it were to be announced. This persistent self-interest of a few has been going on for too long. Enough is enough."
The Premier League's statement in full
The Premier League has released an additional statement which reads: "The Premier League condemns any proposal that attacks the principles of open competition and sporting merit which are at the heart of the domestic and European football pyramid.
"Fans of any club in England and across Europe can currently dream that their team may climb to the top and play against the best. We believe that the concept of a European Super League would destroy this dream.
"The Premier League is proud to run a competitive and compelling football competition that has made it the most widely watched league in the world. Our success has enabled us to make an unrivalled financial contribution to the domestic football pyramid.
"A European Super League will undermine the appeal of the whole game, and have a deeply damaging impact on the immediate and future prospects of the Premier League and its member clubs, and all those in football who rely on our funding and solidarity to prosper.
"We will work with fans, The FA, EFL, PFA and LMA, as well as other stakeholders, at home and abroad, to defend the integrity and future prospects of English football in the best interests of the game."