LaLiga has filed a complaint to UEFA against Manchester City and Paris St Germain over alleged Financial Fair Play violations.
The Spanish league said it would take "further legal action to the European Union, France and Switzerland" justice systems as it understands that "these clubs are continually breaching the current regulations" of financial fair play.
LaLiga said it lodged the complaint against Manchester City to UEFA in April before filing the one against PSG last week.
LaLiga president Javier Tebas said last month the organisation would take legal action against the French club after Kylian Mbappe snubbed a widely-tipped move to Real Madrid at the 11th hour and renewed his contract with PSG until 2025.
LaLiga reacted angrily to Mbappe's contract extension, saying PSG's new offer to Mbappe "attacks the economic stability" of European football.
La Liga said last month: "It is scandalous a club like PSG, which last season reported losses of more than €220m, after accumulating losses of more than €700m in prior seasons (while reporting sponsorship income at a doubtful valuation) with a cost of sports staff around €650m for this 2021-22 season, can face an agreement of these characteristics while those clubs that could accept the arrival of the player without seeing their wage bill compromised, are left without being able to sign him."
This is not the first time that LaLiga has filed complaints against "state owned clubs" PSG and Manchester City.
PSG is owned by the state-run Qatar Sports Investments, while City is under Abu Dhabi ownership.
In 2017 and 2018, it had also filed complaints against the two clubs over breach of financial fair play rules, leading to sanctions by UEFA. However, City and PSG lodged appeals with the Court of Arbitration for Sport (CAS), who ruled in the two clubs' favour, a decision the Spanish league called "strange".
LaLiga also announced it was "studying different legal options in Switzerland" against PSG president Nasser Al-Khelaifi for "possible conflicts of interest" derived from his different roles running the French club, and his different roles in UEFA, European Club Association (ECA) and BeIN Sports.
