France captain Kylian Mbappe missed training ahead of Thursday’s Nations League meeting with Italy.
The French coaching staff confirmed that the Real Madrid forward remained “under treatment” but offered no further details about his condition.
Mbappe, 27, has returned to the France squad for the current international break after missing the previous three matches through injury.
He scored the winning goal in Zinedine Zidane’s first match in charge against Turkey in September but was forced off shortly afterwards after experiencing pain in his left knee.
France will be keen to have their captain available for the trip to Milan as they look to secure their place in the Nations League quarter-finals.
Les Bleus currently lead Group A1 after collecting three wins and a draw from their opening four matches. They face Italy on Thursday before hosting Turkey in Bordeaux on Sunday, with qualification within their reach.
