Let him go, take the loss on the chin and get him out of the club. Not every single player or talent is covered by Riola, so lesson learned here for the board.
Get a director of football in place who knows how to work with agents like Riola, he is playing us like a finely tuned violin at the moment.
I don't think there is a DoF at a top club that knows how to work with Raiola.