The brother of Paul has been charged with trying to extort money from his brother.
Judicial sources told news agencies that four other people have also been put under formal investigation.
His client is not guilty, according to his lawyer.
He said that they would challenge the decision.
There was a video on the internet last month that promised "revelations" about the 29-year-old Bianco player.
French prosecutors opened a judicial investigation after Paul said he was the target of extortion and threats.
He claimed that he was the target of a 13 million euro blackmail plot.
The World Cup winner with France, Paul Pogba, left Manchester United for a free transfer to the Italian team.
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