Former Inter-full back Jonathan accuses the club of “serious negligence” in the treatment of his knee injury.
The Brazilian made just two Serie A appearances for the Nerazzurri last season, and move to Fluminense in the summer.
“It was undoubtedly the most difficult period of my career,” Jonathan explained to Globoesporte.
“I was out for almost eight months. It made me stronger as a player and a man though. Now I want to explain everything to the youngsters.