The coach is definitely the problem, but Cambiaso doesn't get a pass here IMO. No excuses for going against your coach like this in public. He was on the bench, so he was deemed ready to at least play a part of the game.
Even if they agreed he would only play a certain amount, the injury to Veiga changed this. At least leave the frustration for the dressing room, if you really feel like you are mismanaged. The City talk seems to have gotten to him, he really is starting to be like his idol Cancelo.
It's a shame, had hopes for him to become a bandiera for us.