La Liga have confirmed they will report Paris Saint-Germain to a number of authorities after they announced that Kylian Mbappe will stay at the club.
Mbappe had long been linked with a move to Real Madrid, only for PSG to trump them with a huge contract offer this week.
PSG announced on Saturday evening that Mbappe would be staying, but just before that, La Liga revealed that they would not be taking this matter lightly.
A statement read: "On Kylian Mbappe's possible announcement to stay at Paris Saint-Germain (PSG), LaLiga wishes to state this type of agreement attacks the economic stability of European football, putting at risk hundreds of thousands of jobs and the integrity of the sport, not only in European competitions, but also in domestic leagues.
"It is scandalous that a club like PSG, which last season reported losses of more than 220 million euros after accumulating losses of more than 700 million euros in prior seasons (while reporting sponsorship income at doubtful valuation), with a squad cost around 650 million for this season, can close such an agreement, while those clubs that could afford the hiring of the player without seeing their wage bill compromised, are left without being able to sign him.
"LaLiga will file a complaint against PSG before UEFA, the French administrative and fiscal authorities and European Union authorities to continue to defend the economic ecosystem of European football and its sustainability.
"In the past LaLiga has complained to UEFA for non-compliance with financial fair play by PSG. These complaints were successful and UEFA sanctioned the club, while the Court of Arbitration for Sport (CAS), in a bizarre decision, reversed the sanctions.
"LaLiga and many European football institutions had hope that PSG President Nasser Al-Khelaifi after entering bodies of European football management such as the UEFA Executive Committee and the presidency of the European Club Association (ECA) would refrain from carrying out these practices knowing the serious damage they cause, but it has not been like that, quite the opposite. Being PSG with unacceptable salary masses, with large economic losses in previous seasons, it assumes an impossible investment in this situation, which undoubtedly implies non-compliance with the current economic control regulations not only of UEFA, but of French football itself.
"These behaviours denote even more that the state clubs do not respect or want to respect the rules of an economic sector as important as football, key to the sustainability of hundreds of thousands of jobs.
"This type of behaviour led by Al-Khelaifi, president of PSG, due to his status as a member of the former UEFA, president of the ECA, is a danger to European football at the same level as the Super League."