When you hear Narduzzi say "mutually agreed", that means he dismissed you from the team. If it were solely the decision of the player, they say he's transferring...
Same thing in the case of Mychale Salahuddin. Last season Salahuddin tweeted he was "lied to". He didn't state who lied to him, but it became abundantly clear that he was referring to the staff. He thought he could walk in and start. Narduzzi told him didn't earn it and to leave if he can't accept it... So they "mutually" parted ways...