Neymar was forced off just minutes into Tuesday's friendly match with Cameroon due to an apparent thigh injury.
The Paris Saint-Germain star was captaining the Selecao in the clash at Stadium MK, but pulled up injured while playing a cross in the game's early moments.
Neymar's day lasted just eight minutes, as he was removed from the match with Everton star Richarlison taking to the field in his place while Marquinhos assumed captain's duties.
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According to Globo TV , Neymar is being treated by Brazil's physio team in the dressing room for a pulled thigh muscle, although the team has not yet confirmed the severity of the injury.