The 24-year-old has been linked with a summer move to Bordeaux.
“I am convinced that he will stay,” Casanova told L’Equipe.
“However, I am not in his mind or that of his agent. No club has shown an interest as yet.
“That doesn’t mean that he has lost his value. He endured a difficult season with injuries, and a difficult World Cup, but I am convinced he will have a great season this year if he remains with us.”
