The source, who wished to remain anonymous, said 32-year-old Mathias Pogba, who is also a professional footballer but represents Ghana, met with police investigators on Wednesday afternoon and was subsequently taken into custody.
The three other suspects were taken into custody on Tuesday, according to the source.
In August, Mathias Pogba, brother of Juventus star Paul Pogba, posted a video promising “big revelations” about his brother and his agent Rafaela Pimenta.
At the same time, Paul Pogba is said to have been blackmailed for money and according to the French radio network France Info, it is 130 million Swedish kronor.
“Paul Pogba has suffered threats and blackmail attempts by an organized gang. This has been referred to the appropriate authorities in both Italy and France,” the soccer star said in a statement, and the French prosecutor’s office subsequently received a report.
Mathias Pogba denies the allegations.