ESPNcricinfo has stated understands that allrounder Shahbaz Ahmed and batter Shreyas Iyer have been drafted into the squad, although it is not yet known if they are replacement players or just reserves.
India’s revised squad for South Africa T20Is:
Rohit Sharma (Captain), KL Rahul (vice-captain), Virat Kohli, Suryakumar Yadav, Shreyas Iyer, Rishabh Pant (wicket-keeper), Dinesh Karthik (wicket-keeper), R. Ashwin, Yuzvendra Chahal, Akshar Patel, Shahbaz Ahmed, Arshdeep Singh, Umesh Yadav, Harshal Patel, Deepak Chahar, Jasprit Bumrah.
(source: Cricinfo)