According to multiple AFP sources and French daily lâĂquipe, football star Neymar is among them.
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French sports daily L'Ăquipe reported the players in question were Neymar, Angel Di Maria and Leandro Paredes, but PSG did not reveal any names.
"Three Paris Saint-Germain players have confirmed positive Sars CoV2 tests and are subject to the appropriate health protocol," PSG said in a statement. "All of the players and coaching staff will continue to undergo tests in the coming days."
The French champions, who last month lost the Champions League final to Bayern Munich, had already said on Monday that two unnamed players had reported back with coronavirus symptoms following a holiday.
L'Ăquipe reported the players in question were Argentinian duo Di Maria and Paredes. Now it claims Neymar is the other squad member to test positive.
The first game of the French soccer season was postponed last month because of an outbreak of COVID-19 cases at Marseille after the southern club confirmed three positive cases among its first-team players and staff.
Several other French clubs have been hit by the virus, including Montpellier, Rennes, and Lyon.
French soccer was widely criticized in the spring after it was the highest-profile European league to end the season early during the pandemic rather than try to restart. The standings were declared final with PSG retaining its title and Marseille second.