UEFA has brought in new financial regulations which will limit clubs’ spending on wages, transfers, and agents’ fees to 70% of their revenue.
Permitted losses over a three-year period have also risen from 30m euros (£24.98m) to 60m euros (£49.96m).
The new rules will come into force in June and clubs will have three years to implement them.
UEFA said, “breaches will result in pre-defined financial penalties and sporting measures”.
It is thought new reinforced punishments, including points deductions, demotion to lower-ranking competitions, and potential exclusion from European football completely will be introduced as part of the new regulations.
Clubs are expected to be allowed to spend 90% of their income in 2023-24, reducing to 80% in 2024-25 and 70% a year later.
The new “financial sustainability regulations” have been put together by UEFA and the influential European Clubs Association (ECA) and “are the first major reform” of the financial fair play (FFP) rules introduced in 2010.
“UEFA’s first financial regulations, introduced in 2010, served its primary purpose,” said Aleksander Ceferin, president of European football’s governing body.
“They helped pull European football finances back from the brink and revolutionised how European football clubs are run.
“However, the evolution of the football industry, alongside the inevitable financial effects of the pandemic, has shown the need for wholesale reform and new financial sustainability regulations.
“These [new] regulations will help us protect the game and prepare it for any potential future shock while encouraging rational investments and building a more sustainable future for the game.”
In a statement, Uefa added: “While the acceptable deviation has increased from 30m euros over three years to 60m over three years, requirements to ensure the fair value of transactions, to improve the clubs’ balance sheet, and to reduce debts have been significantly strengthened.
“The biggest innovation in the new regulations will be the introduction of a squad cost rule to bring better cost control in relation to player wages and transfer costs.
“The regulation limits spending on wages, transfers, and agent fees to 70% of club revenue.”