Victoriano Melero, general secretary of Paris Saint-Germain (PSG) from Ligue 1, said in a letter seen by Reuters that La Liga President Javier Tebas should deal with his own problems of debt and "mismanagement" of the Spanish league.

"Time after time, you allow yourself to publicly attack the French League, our club, our players – together with players of other clubs – and the fans of French football; while constantly posting insulting and defamatory statements insinuating that we do not conform to the football financial regulations, amongst other unsubstantiated statements," said Melero in the letter.

"The French League did not, like your league, wait until recent years to take actions and put in place strong financial regulations. It is now publicly known that certain Spanish clubs and your league are facing unsustainable levels of debt after gross mismanagement, not to mention the way Spanish football has been financed over the past decade – including by the state," added Melero.

Melero's letter was the club's response to Tebas for his long-standing criticism of the French giants. For example, after PSG signed Sergio Ramos (who left Real Madrid) and Lionel Messi (who departed Barcelona), Tebas said their investments were dangerous at a news conference.

"PSG looks like the league of legends given the age of some players. La Liga has young players like Vinicius Junior. The problem of PSG, we will solve it. What PSG are doing is as dangerous as the Super League. We will continue to grow despite the departure of Messi. We will work against the club states. These clubs are as much enemies as the Super League," said Tebas.

Melero was not wrong about certain clubs, namely Real and Barca, being under huge debt. It has been two years since Real bought anyone on the transfer market. Barca had to watch Messi and Antoine Griezmann go while asking their key players to accept pay cuts. According to Barca President Joan Laporta, their debt is as high as $1.6 billion.

"I am quite surprised you are not focusing more of your attention on the two clubs in your league that remain steadfast focused on breaking up your League, and European football as a whole. We invite you to focus on solving your domestic issues, which you are responsible for, and to stop your transparent and repeated diversion attempts," said Melero.