Tevez made public his desire to leave in the summer and was stripped of the captaincy by boss Roberto Mancini.
"There's a lot of respect for Carlos because he's a great guy and a great footballer," Hart told Football Focus.
"You wake up and read one thing about him but in training he's really committed to what he's doing."
And the England keeper added: "He's never disrespected the club in any kind of way or disrespected us as team-mates.
"He's got on with it."