The 2004 Champions League winners and this season's quarter finalists have stated they were offered into the European Super League, but turned it down.
"There were informal contacts from some clubs, but we didn't pay much attention for two reasons. The first is that the European Union does not allow a closed circuit of events like in the NBA, for example. As the Portuguese Football Federation is against this, and as part of UEFA, we cannot participate in anything that is against the principles and rules of the European Union and UEFA.
"If that goes forward, something that I have a lot of doubts about, UEFA will not end and it is certain that they will continue to have evidence. It must be recognized that the events organized by UEFA are the official events. We are not concerned with being or not, we are in the Champions League and we hope to continue to be for many years."
Borussia Dortmund and Bayern Munich
European champions, Bayern Munich, and the 1997 Champions League winners, Borussia Dortmund, have come together to fight against the Super League.
"The board members of the European Club Association (ECA) came together for a virtual meeting on Sunday evening, where it was agreed that the board's decision from last Friday still stands,'' said Dortmund CEO, Hans-Joachim Watzke.
"This decision dictates that all clubs wish to implement the proposed reforms to the UEFA Champions League. The ECA board members took a clear stance in rejecting plans for the establishment of a Super League."
"Both German clubs on the ECA board, FC Bayern Munich and Borussia Dortmund, shared exactly the same stance throughout all discussions."
La Liga giants Valencia are the first Spanish team to officially fight back.
"Valencia CF and LaLiga strongly condemn the recently published proposal for a breakaway, elitist European competition that attacks the principles of open competition and sporting merit which are at the heart of the domestic and European football pyramid.
"Today football fans across Europe can dream that their club, no matter the size, may excel, climb to the top and compete at the pinnacle of European football. Valencia CF and LaLiga defend this European tradition of football for all. The concept proposed by 12 European clubs destroys that dream, shutting the door to the top of European football, allowing in just an elite few."
Another German team joins the fightback.
"This Super League is for the super-rich which places itself above the organic structures in football. It is an attack on UEFA's club competitions and in particular on the national leagues. It is cynical and duplicitous to claim that this step is for the good football or reflects the wishes of football fans.
"We can be proud that all the German clubs have rejected this league and we will fight to ensure that those clubs involved are shut out of all international and national competitions"
"Real Betis and LaLiga strongly condemn the recently published proposal for a breakaway, elitist European competition that attacks the principles of open competition and sporting merit which are at the heart of the domestic and European football pyramid.
"Today football fans across Europe can dream that their club, no matter the size, may excel, climb to the top and compete at the pinnacle of European football. LaLiga defends this European tradition of football for all. The concept proposed by 12 European clubs destroys that dream, shutting the door to the top of European football, allowing in just an elite few."
"Everton is saddened and disappointed to see proposals of a breakaway league pushed forward by six clubs.Six clubs acting entirely in their own interests.Six clubs tarnishing the reputation of our league and the game.Six clubs choosing to disrespect every other club with whom they sit around the Premier League table.Six clubs taking for granted and even betraying the majority of football supporters across our country and beyond.At this time of national and international crisis - and a defining period for our game - clubs should be working together collaboratively with the ideals of our game and its supporters uppermost.
"Instead, these clubs have been secretly conspiring to break away from a football pyramid that has served them so well. And in that Pyramid Everton salutes EVERY club, be it Leicester City, Accrington Stanley, Gillingham, Lincoln City, Morecambe, Southend United, Notts County and the rest who have, with their very being, enriched the lives of their supporters throughout the game's history. And vice versa. The self-proclaimed Super Six appear intent on disenfranchising supporters across the game - including their own - by putting the very structure that underpins the game we love under threat. The backlash is understandable and deserved – and has to be listened to.
"This preposterous arrogance is not wanted anywhere in football outside of the clubs that have drafted this plan. On behalf of everyone associated with Everton, we respectfully ask that the proposals are immediately withdrawn and that the private meetings and subversive practises that have brought our beautiful game to possibly its lowest ever position in terms of trust end now. Finally, we would ask the owners, chairmen, and Board members of the six clubs to remember the privileged position they hold – not only as custodians of their clubs but also custodians of the game. The responsibility they carry should be taken seriously.
"We urge them all to consider what they wish their legacy to be."
West Ham United
"West Ham United shared its views and those of its supporters expressing vehement opposition to the proposal for a Super League at a Premier League meeting held on Tuesday morning.
"Following a meeting between senior Club officials and the Independent Supporters’ Committee within 24 hours of the news breaking, Vice-Chairman Karren Brady met with representatives from 13 other Premier League clubs to share the Hammers’ unequivocally strong disapproval of a proposal by six clubs to create a breakaway league that undermines our values and those of the game we all hold so dear.
"As a Club that was founded by working-class shipbuilders over 125 years ago, is deeply rooted in its own community and is acutely aware of the traditions of English football, we passionately believe that there should be no barrier to supporting West Ham United and these proposals go entirely against the integrity of our Beautiful Game.
"Thames Ironworks FC was formed in June 1895 by Arnold Hills, a man who believed his local community should have its own football team. Well over a century later West Ham United, owned by two supporters, remains at the heart of our community, true to its working-class values. From humble origins, the Club grew, attracting more support and better players, working its way up through the football pyramid to earn its place at the highest level of the game, where we are proud to be today and giving our all in line with those values, to achieve a place in Europe."
"The EFL stands with the Premier League, The FA, PFA, LMA, the FSA and colleagues across European professional football in condemnation of proposals which attack the foundation of open and fair competition upon which our game is built.
"A strong pyramid based on promotion, relegation and ultimately European qualification, is fundamental to our game’s continued success. The EFL opposes any reform that doesn’t support competition integrity or offer Clubs the prospect of one day competing at the highest end of the game. Collective reform efforts should be focused on creating conditions that foster long-term sustainability at all levels of the domestic football and remove the current, almost impossible financial pressures created as a result in the huge difference of revenues allocated to the Premier League in comparison to the Championship and Leagues One and Two.