Neymar sat out Brazil's training session for a second straight day during the team's Copa America preparations as he continues to recover from a left knee problem.
It is believed that, after taking a shot at goal, the 27-year-old looked to be in pain as he grabbed his left leg, before being helped off the pitch by medical staff.
Brazil kick-off their Copa America campaign against Bolivia on June 14 - the opening match of the tournament.
The footballer's father, Neymar dos Santos, told Band TV in Brazil on Saturday that "it is clear that it was a trap".
PSG star Neymar sustained knee injury during Brazilian squad training, Globo Esporte reported.
Neymar had to stop training on Tuesday when he suffered a knee strain, although the injury was not thought to be serious.
Neymar now earns around £622,000 a week at Paris Saint-Germain where he moved for a world record £198 million in 2017 from Barcelona.
The right-back was expected to be Brazil's captain during the World Cup in Russian Federation, but he suffered a left knee injury that didn't allow him to play.
Brazil are searching for their first Copa America title since 2007, with Chile the reigning champions after successfully defending their title in 2016.
Brazil coach Tite had named Neymar permanent captain a few months after Brazil's World Cup quarter-final exit at the hands of Belgium last year, but has been under pressure to replace the 27-year-old due to his disciplinary issues. "It is more than being the team's star".
Neymar recently showed support for far-right President Jair Bolsonaro, who has made a series of racist, misogynistic and anti-gay statements. Neymar was injured and didn't play in the 7-1 loss to Germans.