"Any club or player involved in such a competition would as a consequence not be allowed to participate in any competition organised by FIFA or their respective confederation," said Thursday's statement.
The Times of London reported on Thursday that plans were afoot for a Super League featuring 15 permanent founding members, including six from England, three each from Spain and Italy, two from Germany and one from France.
However, at the same time discussions are still ongoing about the future format of the UEFA Champions League, currently the world's most lucrative and prestigious club competition which is due for reform of some kind from 2024 onwards.
"This is the foundation of the model and the main reason for football's success.
"SD Europe unanimously agrees with @EuropeanLeagues and supports its position on maintaining the European model of sporting competition in football," it said.
- New Club World Cup -
The delayed 2020 edition of the Club World Cup will go ahead next month in its existing format, involving only the champions of each confederation -- minus New Zealand's Auckland City who withdrew due to the pandemic -- plus the champions of host nation Qatar.