Fifa is facing the threat of legal action from domestic leagues and player unions if there is no rescheduling of the 2025 Club World Cup.
A letter to Fifa president Gianni Infantino, seen by AFP, claims the sport's worldwide schedule is now "beyond saturation".
The letter was sent by the World Leagues' Association (WLA) and FIFPRO, the international players' union, which include the Premier League and England's Professional Footballers' Association among their respective memberships.
It warns calendar changes including the new 32-team Club World Cup – scheduled to take place in the United States in June and July 2025 – have created "economic harm" to domestic leagues and pushed players "beyond their limits".
The letter urges Fifa's ruling council to reschedule the Club World Cup and re-open talks on the international calendar for the years up to 2030.
"Should Fifa refuse to formally commit to resolving the issues, as set out above, at its upcoming council, we shall be compelled to advise our members on the options available to them, both individually and collectively, to proactively safeguard their interests," the letter said.
"These options include legal action against Fifa, on which we have now commissioned external expert advice."
The football schedule will already expand next season, with the Champions League and Europa League to have eight first-phase games compared to six this term.
The Champions League, Europa League and Uefa Conference League will all be increased to 36 teams.
'SOMETHING HAS TO GIVE'
WLA and FIFPRO accused world football's governing body of "continually and consistently making unilateral decisions that benefit its own competitions and commercial interests, while negatively affecting national leagues and
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