Grenoble - Grenoble's 20-year-old back-rower Antonin Berruyer will not play again this season after suffering a stroke, the Top 14 club said on Tuesday.
Berruyer, part of France's 2018 Under-20 World Cup winning squad, reportedly became dizzy while in his room at the club's youth facility last week and was taken to hospital.
The club said he had undergone tests on Monday and would return home at the weekend.
Local newspaper, The Dauphine Libere, quoted several sources as saying "it is difficult to determine the gravity of the incident."
Berruyer, who is 1.87m tall and weighs 96kg, has appeared in 10 matches for promoted Grenoble, who are 13th in the Top 14, this season, starting six league games.