It says no player would be eligible for FIFA or UEFA tournaments.
A joint statement from FIFA and the six football confederations has reiterated that a closed European Super League would not receive support from any of them.
It adds that any club or player involved in such a competition would not be allowed to compete in the World Cup, the Euros or any tournament organised by FIFA or the regional confederations.
The document is signed by the presidents of each organisation, including FIFA's Gianni Infantino and UEFA's Aleksander Ceferin.
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