Tevez hit the winner at Aston Villa on Monday night.
Zabaleta said: "Yes, he definitely is, 100 per cent. He's been great all season."
Zabaleta added: "It has been so difficult for Carlos, for Mancini, for the club. From something very small, it grew so big.
"Everything went crazy and it was difficult for everyone.
"Everybody makes mistakes, the positive thing is Carlos came back and the commitment for the club and team has been 100 per cent, so that is well done by him."