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Pant notched up his fifth Test hundred off 89 balls to bail India out of trouble from 98/5 after being put in to bat in the series decider.
The Test match is scheduled to begin from July 1 in Birmingham and if Rohit remains in six-day isolation, either pacer Jasprit Bumrah or wicket-keeper batter Rishabh Pant could be asked to lead the team.
He scored 76 off 87, hitting 14 boundaries and a six.
The touring side won the first two matches before India bounced back to level the series at 2-2.
Harshal Patel (4/25) and Yuzvendra Chahal bagged (3/20) helped India make it 2-1 in five-match series.
Klaasen scored 81 off 46 deliveries to help the visitors post a 4-wicket win.
The two scored unbeaten fifties as South Africa chased down India's total of 211/4.
The 30-year-old from Bengaluru will now have to report to the National Cricket Academy where the medical team will assess and decide on the future course of treatment.
Ruturaj Gaikwad and Ishan Kishan are expected to open for India.
The wicketkeeper-batter is currently in Delhi with Team India as the five-match T20I series against South Africa begins on Thursday at the Arun Jaitley Stadium.