Zabaleta believes Tevez is now happier and willing to stay at City.
The defender said: "We are all trying to forget what happened last season.
"Carlos has been fantastic in training. He's been prepared to work hard for the team and with his attitude and effort, that's good for us.
"We know how important he can be and the way he is playing he'll help us to more success. It's good for me and Sergio (Aguero) too - the Three Amigos. I really enjoy having them both here, it's great."