Zaheer bowled at the nets, and according to his team-mate Jaydev Unadkat, looked good as he was getting the ball to swing both ways.
Zaheer had sustained a calf injury during Mumbai's Ranji Trophy game against Gujarat last December. He was dropped from the Indian Test squad against England.
"Zaheer looked good as he was getting the ball to swing both ways as he normally does and it was good bowling in tandem with him at the nets. I learnt a lot by just seeing him bowl from close quarters," Unadkat told reporters after the training session.
"I am hitting 135 kmh mark at present," he said.
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Unadkat said he has been working on variations for the IPL. "We have been working on pace and slower ones (to put them in use)," he said.
He said he has been working on increasing his pace.
"I have been working quite a bit on it during off-season as well. I am really looking in good rhythm for now," the left-arm fast bowler said.