Il Corriere Dello Sport says Toni has reached the point of no return over his relationship with coach Louis van Gaal and is keen on leaving the club.
Reports says Roma are favoruties to sign the striker in January.
“My relationship with the coach is terminated, I want to return to Italy,” Toni said to Rai 3 on Monday.
“If he doesn’t change behaviour then we will consider Luca Toni’s exit,” said Bayern sporting director Christian Nerlinger.