Bishnoi replaces Varun as a fast bowler.
Varun suffered a muscle strain and cannot play.
The tour takes place in Zimbabwe with three One Day International games.
Coaches expect Bishnoi to improve the team's bowling performance.
Varun sustained a muscle strain during training, ruling him out of the series.
The Indian cricket side will travel to Zimbabwe to compete in a three‑match One Day International series.
Team management believes Bishnoi can strengthen the bowling attack.
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