Paris Saint-Germain are under investigation by French prosecutors over alleged undeclared labour, the Paris prosecutors' office said on Tuesday.

"Following a complaint received on 13 December, 2022, an investigation was opened on 16 January, 2023 on the grounds of undeclared work," the office said.

The complaint was launched by Tunisian national Hicham Bouajila, who claims he worked for the club's president Nasser al Khelaifi as an advisor, his lawyer, Bertrand Repolt, told Reuters.

"He was never employed by PSG," the Ligue 1 club were quoted as saying by French sports daily L'Equipe.

French champions PSG did not respond to a request for comment by Reuters.