Arsenal, Chelsea, Liverpool, Manchester City, Manchester United, and Tottenham have agreed to join a breakaway European Super League.
In addition, three La Liga teams and three Serie A clubs have agreed to join the new Super League.
The new league format has been put forth as a rival to the UEFA Champions League, but not as a stand-in to domestic leagues.
A joint statement read: “Twelve of Europe’s leading football clubs have today come together to announce they have agreed to establish a new mid-week competition, the Super League, governed by its Founding Clubs.
“AC Milan, Arsenal FC, Atlético de Madrid, Chelsea FC, FC Barcelona, FC Internazionale Milano, Juventus FC, Liverpool FC, Manchester City, Manchester United, Real Madrid CF and Tottenham Hotspur have all joined as Founding Clubs.