Neymar believes the left knee problem he picked up in Copa America preparations was just a scare.
The Paris Saint-Germain star says he is in good shape for the tournament which begins in two weeks.
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Brazil's football confederation published a video of the star working out at the gym of the Granja Comary training center outside Rio de Janeiro and added he is still undergoing treatment.
The Brazil striker sat out two training session outside Rio de Janeiro to rest the knee. However, in a quick interview with TV Globo on Friday, he calmed fans who worried about his fitness.
The 27-year-old limped out of Brazil's first full training on Tuesday.
Neymar, who was stripped of his captaincy for the tournament, has played only four matches for Paris Saint-Germain since his return in April from a right-foot injury.
Brazil's football confederation would not confirm whether he will take part in training on Friday.