Key Capital Partners and Real Madrid have not commented on the report while the European Club Association, which represents more than 200 European clubs, has said it was not aware of discussions by clubs to develop a break-away league.
They suggest the 11 founder members of the league, which it is claimed could be established by 2021, would be immune from relegation for 20 years.
According to documents published as part of the Football Leaks allegations, a group of European clubs have discussed the idea of establishing a closed competition without relegation or promotion which would replace the Champions League.
Football Supporters' Federation chair Malcolm Clarke said: "Yet again there is a far-reaching proposal being drawn up by big clubs whose primary interest is making as much money as possible without any consultation with fans at club, national or European level".
German magazine Der Spiegel and European Investigative Collaborations, a network of global media, reported last week that plans for a Super League, involving top clubs such as Real Madrid and Manchester United, were back on the table.
'The Association of European Leagues has consistently voiced its strong opposition to the creation of any "closed and franchised-style" Super League.
According to the document a further five clubs - Atlético Madrid, Borussia Dortmund, Marseille, Internazionale and Roma - would also appear as "initial guests".
"Proposals for a closed Super League will have serious and lasting implications for the long-term sustainability of professional football in Europe".
A Westminster source has said that such a move would be strongly opposed by the government, while Uefa president Aleksander Ceferin yesterday promised to "fight against" the idea. "To see Juve versus Bayern every week would be more boring than let's say Juve versus Torino", he told Kicker.
Karl-Heinz Rummenigge said: "FC Bayern Munich stands by its membership of the Bundesliga and, as long as I am chairman of the board of FC Bayern, also by the club competitions organised jointly by UEFA and the ECA".