The Swede continues to be linked with a move away this summer.
"His trophy cabinet speaks for him, as he is a winner. I'm happier to have someone in the squad who goes crazy if he doesn't win compared to people who don't care whether they win or lose," Vice-President Galliani told the official club website.
"I promised him the Number 10 jersey, even if I haven't spoken to Seedorf yet. If Clarence no longer wears it, then that is up to him. Zlatan had asked for the 10 when he signed the contract from Barcelona, but at the time it was occupied."