Investigators in Rio are specifically looking into Neymar's posting on social media of images and messages of the Brazilian model without authorization, a possible violation of her online privacy.
A separate investigation into the model's rape accusations against Neymar at a Paris hotel in May was shut down by a judge earlier this month, citing a lack of evidence against the player.
This week, police in Sao Paulo indicted Trindade for procedural fraud, slanderous denunciation and extortion.
Coming out of police offices Wednesday, Trindade's lawyer, Cosme Araujo, said he is looking into pressing charges in Paris.
Neymar has always denied the accusation and said their relations were consensual.
The Associated Press doesn't name alleged sexual assault victims unless they make their identities public, which Trindade did in interviews.