Duminy suffered a hamstring strain in their game against Afghanistan. The exact length for his recovery is unknown but South Africa are hopeful of having him ready for their final group game against Sri Lanka next Monday (March 28). (WT20 schedule)
Scans confirmed the injury, team manager Mohammed Moosajee said. Duminy has scored 83 runs in two matches without being dismissed, and also took 1-31 in the loss to England.
In Duminy's absence, South Africa will include Aaron Phangiso to complement the legspin of Imran Tahir with the wicket in Nagpur likely to suit spinners.
Duminy sustained the injury when he chased the third ball of Afghanistan's innings and left the field before the opening over was completed.
"Brandon Jackson, our physio, will have his work cut out for him. With these things you can't really put down a time frame. It could be anything from seven to 14 days," Moosajee said.