Uefa has serious concerns about the impact of the Premier League's new financial rules on the rest of Europe.
England's top-flight clubs have voted to move to a system called squad cost ratio (SCR) next season.
This allows teams to spend 85% of their income on player costs, although a complicated set of factors means clubs could go as high as 115%.
Uefa's SCR spending limit is 70%, which all clubs in the Champions League, Europa League and Conference League must adhere to.
There is no universal SCR or percentage across the top leagues, but others have more stringent rules than the Premier League.
It means Premier League clubs not in Europe would have much higher spending power.
Uefa, European football's governing body, fears that it could undermine financial stability measures.
Clubs on the continent may be forced to take additional risks - facing higher costs and losses - to retain their players.
But the Premier League rejects the claim, insisting its new rules will ensure competitive balance. It is against one uniform financial fair play system.
