Natarajan had played only two out of the four games for Sunrisers Hyderabad this season and it is understood that he never fully recovered from the knee injury he sustained on the tour of Australia.
Chakravarthy has repeatedly failed to clear the fitness test at the National Cricket Academy in Bengaluru
Natarajan has been released from the Tamil Nadu squad for the Vijay Hazare Trophy ODI competition so that he stays fresh for the limited-overs series against England next month
The 30-year-old Natarajan, who bowled a maximum 71 yorkers among all pacers in the last IPL, dismissed big names such as Dhoni and AB de Villiers during the season.
Natarajan missed the birth of his daughter as he was in UAE playing IPL for Sunrisers Hyderabad
Natarajan, who went to Australia as a net bowler, became the first Indian cricketer to make his international debut across all three formats during the same tour.
Thangarasu Natarajan had a shoulder injury as well as a knee niggle that had ruled him out of the first couple of games of the five-match T20I series
Besides Ashwin and Pant, two other Indians -- Mohammed Siraj and T Natarajan -- are also in the fray.
Thangarasu Natarajan became the only Indian player to make a debut in all three formats in the same tour
An injury-plagued India registered an epic come-from-behind Test series win in Australia. Here's to 'India-A's' class act Down Under
And they are: Mohammed Siraj, Shardul Thakur, Shubhman Gill, Thangarasu Natarajan, Navdeep Saini and Washington Sundar
Australia opener David Warner has heaped praise on his Sunrisers Hyderabad teammate and India bowler Thangarasu Natarajan
Pant, Sundar, Siraj along with T Natarajan and Shubman Gill helped India breach Fortress Gabba and retain the Border-Gavaskar Trophy
India dismissed Australia for 294 in the 2nd innings to set themselves a 328-run target to take the series. Catch highlights of Day 4 of the fourth AUS vs IND...
Shardul took three wickets with the ball in Australia's first innings and then top-scored for India with a 67
Natarajan, who came in as a net bowler, joined fellow rookies Mohammed Siraj, Washington Sundar and Shardul Thakur to restrict Australia to 369
Hit by a barrage of injuries through the series, India picked debutants Washington (3/89) and medium pacer T Natarajan (3/78) in the playing eleven on Friday.
With heavy thundershowers preventing any play in the post-tea session, India ended the day at 62 for two
Another debutant and Washington Sundar's Tamil Nadu state-mate, Thangarasu Natarajan also took three wickets as India's young bowlers rose to the occasion
For an attack as thin on experience as India, the effort in adverse times can only be commended. India lost five main bowlers through the three Test matches
India were 62/2 in reply to Australia's first innings total of 369. Catch highlights of Day 2 of the 4th Test AUS vs IND in Brisbane
The Indian team took another hit on Friday when pacer Navdeep Saini was forced off the field due to groin pain.
Marnus Labuschagne (108) helped Australia to 274-5 at stumps on day one at the Gabba, where they are unbeaten in their past 31 Tests
The Indian attack, with a collective experience of 3 Tests and 10 balls and 11 wickets in its kitty, was pitted against a batting line-up with 59 hundreds
Thangarasu Natarajan was one of the rookies named in the playing eleven of the injury-ravaged Indian team against Australia in the fourth and final Test