The 26 year old rued the dropped catches, which ultimately cost India the match and the series.
The focus is to bring momentum back into the Indian dressing room: Morne Morkel
Shubman Gill's form in the series is a concern for India as he has now gone six games without a half-century.
Rana and Sundar also spoke of their respective spells and how they helped India script victory in Sydney.
The Proteas arrive high on confidence, having fought out a hard-earned 1-1 draw in Pakistan last month under challenging conditions.
Australia skipper Mitchell Marsh expressed disappointment at the loss but praised India's all-round performance.
MCG to Barsapara: Gambhir and Pant might be feeling a sense of deja vu
'His point was that if you need workload management, then skip the IPL.'
Intent does not always translate immediately into numbers, and effort however sincere needs to find expression in runs, especially with a World Cup drawing closer.
India, South Africa pretty close on bowling, batters will face big test in getting runs: Amla
The collapse, India's lowest failed chase at home, has left behind deeper fault lines than a dry Eden Gardens wicket can conceal.
Virat Kohli and Rohit Sharma, arrived in Delhi on Tuesday and linked up with rest of the Indian team, many of whom were playing in the two-Test series against West Indies.
They weren't up for a windfall even after the trophy but life was certain to get a lot better as some sponsors and state governments stepped up to lift them financially.
When I'm batting, I think only as a batter: Captain Gill on dual responsibility
IMAGES from the fourth T20I between Australia and India played in Carrara, Gold Coast on Thursday
Images from the fifth T20 International between India and South Africa, in Ahmedabad, on Friday.
India's spinners took six wickets in a stunning fight back to rout Australia by 48 runs in the fourth T20I on the Gold Coast on Thursday.
India will be bolstered by the return of former captains Virat Kohli and Rohit Sharma - both of whom have retired from Test cricket - adding more depth and experience to the side.
Gujarat Titans' skipper Shubman Gill is on the recovery path from a back spasm but his fitness will be assessed carefully at nets ahead of their IPL game against Sunrisers Hyderabad.
This series also marks the return of two Indian heavyweights who will be seen in action for the first time in the Indian jersey since the ICC Champions Trophy Final earlier this year.
India will look to overcome batting inconsistencies and finish the tour of Australia with authority when the two sides clash in the fifth and final T20 International in Brisbane on Saturday.
The Indian team management has kept the media guessing but Rishabh Pant is set to become India's 38th Test captain.
Ravichandran Ashwin questioned India's team selection for the West Indies Test series, highlighting the curious case of Nitish Reddy's inclusion over proven match-winner Axar Patel.
India vice-captain Shubman Gill dethroned Pakistan's Babar Azam from the No. 1 spot in the ICC ODI Rankings for batters on the back of his strong showing against England in the recent home series.
Captain Suryakumar Yadav believes Hardik Pandya's return will restore the tactical depth and balance of India's T20 team.
Rahul Dravid had backed Shubman Gill to become India's all-format captain four years ago.
South Africa were dealt a major blow before the first ball was even bowled, with pace ace Kagiso Rabada ruled out of the opening Test against India due to a rib injury.
South Africa completed a memorable 2-0 series sweep against India after off-spinner Simon Harmer claimed 6/37 to bowl the Proteas to a comprehensive 408-run victory in the second Test,
It's a bit of a shock to see Rohit not going to Australia as captain: Harbhajan
As India gear up for the T20 World Cup at home, the selectors have backed a squad built on impact, and versatility.
India's fielding coach T Dilip has praised the team's "incredible" fielding efforts during their 3-0 ODI series sweep against England.
South Africa's experienced pacer Kagiso Rabada said their young team are ready for the challenge.
Jaiswal ticked a box in the third ODI with his maidan ton and Ruturaj Gaikwad chipped in with a hundred at Raipur, leaving Gambhir pleased as punch.
From Gill to Bumrah: India team, support staff, BCCI VP Shukla arrive at Gambhir's residence for special dinner
Leading from the front, Gill played a captain's knock -which earned him the Player of the Match award.
Shubman Gill on Thursday said he would look to imbibe the 'calmness' that his predecessor Rohit Sharma brought to the dressing room
Spin great Harbhajan Singh said India don't have a specialist off-spinner for Test cricket.
India captain Shubman Gill, head coach Gautam Gambhir along with Jasprit Bumrah, Washington Sundar and Axar Patel arrived in Kolkata late on Sunday ahead of the upcoming two-Test series against South Africa.
This was India's fourth defeat in the last six Tests at home and in all four Tests -- including three against New Zealand -- their batters have flopped against spin.
Shubman Gill joined an unwanted list following the loss to Australia in the first ODI at Perth, becoming the second Indian skipper after Virat Kohli and overall ninth captain to lose their first matches in all three formats as captain.