Marseille announced a trio of "suspected" coronavirus cases have been confirmed just three days before the start of the new season.
The Ligue 1 club revealed on Sunday that three individuals within their "professional workforce" had been detected as potentially having COVID-19.
Their communication at the time indicated the club was seeking confirmation regarding these cases and follow-up tests on Monday all came back positive.
These take the club's positive cases up to four in the past week.
Marseille are due to kick off the 2020-21 Ligue 1 campaign this Friday at home to Saint-Etienne – it is unclear how these new positive tests will impact on that scheduled fixture.
Friday's match will be the first Ligue 1 contest since early March, when French authorities suspended action due to the coronavirus – the competition was then officially ended prematurely on April 28.