Taking to Instagram to make the change public, Verratti, who is on PSG's tour of the United States, thanked former agent Donato Di Campli for his work but said Raiola was the person responsible for representing his interests, starting immediately.
Verratti wrote: "I'm hereby stating with immediate effect that the sole person able to legitimately represent my interests is Mino Raiola. I'm thanking Di Campli for all the work done until today and presenting him with my renewed and unchanged esteem".
The midfielder has been linked to a move to Barcelona for much of the summer, but thus far has been unable to navigate his exit from the Ligue 1 giants.
That had led Di Campli to criticise PSG, claiming the club kept his client as a "prisoner" and that he was trapped.
Verratti would later apologize for Di Campli's statements, saying those were not his words and that he was thrilled to be back with PSG.
However, the switch to Raiola will likely fuel speculation that Verratti is looking for the exit.
Raiola has negotiated big money transfers for the likes of Paul Pogba and Romelu Lukaku to Manchester United. He also pushed Italian teenager Gianluigi Donnarumma toward an exit from AC Milan, before the teen and club came to an agreement over a lucrative new deal.
The 24-year-old Verratti's contract with PSG runs through 2021.