The Spanish football league has demanded the game's authorities investigate Manchester City as well as PSG over their transfer spending.
La Liga is demanding that European football's governing body, Uefa, investigate the two clubs over possible breaches of financial fair play regulations.
PSG and City are owned by members of the royal families of Qatar and the United Arab Emirates respectively. Both sets of owners have poured a huge amount of money into their teams since taking over, transforming the two clubs from mid-ranking contenders into two of Europe's most feared outfits.
This summer PSG prised one of Spain's top players, Neymar, away from Barcelona for a reported transfer fee of €222m (£203m). Another of the game's rising stars, Kylian Mbappe, also moved to Paris despite being widely linked with both Barca and arch-rivals Real Madrid.
La Liga president Javier Tebas has said in a statement that the huge spending by City and PSG “distorts European competitions” and “is irreparably harming the football industry”.
Tebas wrote to Uefa on 22 August demanding the governing body open investigations into City and PSG, according to the Guardian. Last week Uefa announced it would investigate PSG but has said nothing about a probe into City.
Both clubs have consistently maintained that their spending and transfer activity is within official rules.