France forward Kylian Mbappe left Tuesday's training session early due to an injury, according to French media reports.
Mbappe suffered an injury to his left ankle following a challenge with the defender Adil Rami.
He went back to the dressing room rather than continuing the session with his teammates, according to the L'Equipe newspaper.
France arrived in Russia for the 2018 FIFA World Cup on 10 June and are based in the Istra Region, some 50 miles from Moscow.
The team were drawn to Group С and play their first World Cup match against Australia in Kazan on 16 June, then will face Peru in Yekaterinburg on 21 June and Denmark in Moscow on 26 June.