Barcelona have said that Brazil striker Neymar has developed anaemia, but that it won't stop his pre-season training with the Spanish champions.
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Anaemia is a lower than normal count of red blood cells that provokes tiredness or weakness.
Barcelona told The Associated Press that "due to an operation on his tonsils this summer the player is suffering a case of anaemia that is being treated and won't impede him from training with normality with the rest of his team-mates".
The club did not specify what treatment Neymar is following.
Neymar is currently with Barcelona in Israel on a "Peace Tour" of the Middle East. Barcelona open their La Liga campaign against Levante on August 18.
The 21-year-old Neymar joined Barcelona from Brazilian club Santos this summer.