The setback for French soccer comes as Paris Saint-Germain and Lyon prepare to play in the Champions League semifinals in Lisbon — the first time France has had two teams at that stage of the competition.
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. Marseille will play in the next Champions League in October.
In Germany, England, Italy and Spain, leagues restarted after shutting down for several months and completed their programs in June and July. Those leagues start the 2020-21 season in September.
Marseille did not say if any players in the team coached by André Villas-Boas were affected.
Nîmes had also reported one suspected case of COVID-19 last week and canceled a warm-up game against Dijon.
The postponement at Marseille upended plans to begin a new league broadcast rights deal at the Vélodrome Stadium. French media reported the Téléfoot channel, which launched Monday, is working with the league to move a different game into the Friday evening slot.