Neymar issued a statement early on Sunday morning denying any wrongdoing in a case that came to light hours before when Sao Paulo’s public security ministry confirmed a young woman had made the accusation.
The woman, who was not named, alleged that Neymar raped her in a Paris hotel room on May 15.
The PSG forward posted a long video on his Instagram page denying all the accusations, saying he was a victim of extortion and lamenting the pain caused to him and his family.
The video showed what he said were WhatsApp messages he exchanged with the alleged victim, including racy photos she sent him.
In a further complication for the former Santos player, police in Rio said on Sunday they were investigating whether he committed a crime by posting the intimate pictures online.
"I heard about this with great sadness and I thought it strange," Fernandinho, one of the most experienced players in the squad, told reporters at the national team’s training camp outside Rio. "Fifteen days of travel until the girl denounced him.
"But I think this is going to be cleared up as soon as possible and I believe in Neymar’s innocence. We the players and the backroom staff are going to support him so that it doesn’t have any effect on the field."
Neymar arrived at the camp on Sunday in his personalised helicopter but did not speak to reporters.
Brazil are preparing for the Copa America, a tournament played by South America’s 10 national teams plus Japan and Qatar which kicks off on June 14.
Brazil play friendlies against Qatar on June 5 and Honduras four days later.
The 27-year old Neymar became the most expensive soccer player ever when he left Barcelona for Paris St Germain for 222 million Euros ($263 million) in 2017.
Widely acknowledged to be one of the greatest Brazilian players this century, he has become a polarising figure, loved by some for his brilliance with a football but loathed by others for his unapologetically extravagant lifestyle and penchant for diving and feigning injury.
(Additional reporting by Rodrigo Viga Gaier, writing by Andrew Downie, editing by Ed Osmond)
