Das, 21, reported to the national camp at the National Institute of Sport (NIS) in Patiala recently.
Tokyo Olympics 2020: Hima Das vows to make strong comeback after being forced to miss out on Games due to injury
Hima had sustained a hamstring injury while running 100m heats during the National Inter-State Athletics Championships last month.
Tokyo Olympics 2020: Veteran discus thrower Seema Punia seals Olympic quota in Nationals; Hima Das set to miss Games
The 37-year-old Punia, who had won a silver in the 2018 Commonwealth Games and a bronze in the 2018 Asian Games, breached the Olympic qualifying mark of 63.50m.
If the injury turns out to be serious, it will be a big blow to the 4x100m women's relay team's qualification bid for the Tokyo Games as Hima is vital member of the quartet.
Indian men's 4x400m relay team edge closer to Games with 3:01.89 time at National Inter-State Athletics Championships
Muhammed Anas Yahiya, Amoj Jacob, Arokia Rajiv and Noah Nirmal Tom took the track with the singular aim of improving the team's time from 3:02.61 in the Indian Grand Prix 4 on Monday.
Dutee Chand, Hima Das among top athletes taking part in National Inter-State Championships with eye on Tokyo 2020
Graded as 'B' category event by World Athletics, the five-day event offers some of the top athletes the chance to either breach qualifying standards for an automatic Olympic berth or garner valuable ranking points to make it to the Games.
Indian Grand Prix 4: Shot putter Tajinder Singh Toor qualifies for Tokyo Olympics as records tumble in Patiala
Toor crossed the Olympic Qualification mark with a throw of 21.49m and broke his own National Record. The Olympic Qualifying effort in this event is 21.10m.
AFI cancels athletics team's trip to Kyrgyzstan, Kazakhstan over 'quarantine rules', announces Indian Grand Prix 4 as alternative
The decision to hold the fourth series of the Indian GP was taken after the AFI's efforts to send a 40-member team for competitions in Kyrgyzstan and Kazakhstan could not achieve success due to "changed quarantine rules" in those countries.
The women's 4x100m and the men's 4x400m relay teams were to board a KLM flight to Amsterdam in the wee hours on Thursday but the Dutch government has suspended flights from India effective Monday evening.
The top eight finishers in the World Relays on 1 and 2 May at Chorzow in Selisia will get automatic berths in the Tokyo Games, which is scheduled to begin on 23 July.
S Dhanalakshmi, who had beaten Dutee in the final of women's 100m sprint in the Federation Cup last month, was also named in the team, along with Archana Suseendran, Himashree Roy and AT Daneshwari.
Neeraj Chopra, Hima Das to embark on training and competition tour of Turkey in build-up to Tokyo Olympics
Apart from Chopra and fellow Olympic bound javelin thrower Shivpal Singh, country's relay racers (both 4x100m and 4x400m men and women) will be part of the 40-odd contingent that also includes coaches.
S Dhanalakshmi outpaces Hima Das in 200m semi-final heats at Federation Cup National Senior Athletics Championships
Her victory over Hima Das (Assam) in the semi-final heats lifted her to the top 10 of Indian all-time list. Archana Suseendran (Tamil Nadu) won her semi-final heats in 24.07 seconds to raise expectations of an interesting final.
At her induction as DSP, Hima Das revealed that she had dreamt of becoming a police officer when she was young.
Dutee Chand blazed the track to win the women's 100m in 11.44 seconds, an improvement on the 11.51 seconds she had clocked last week in the first GP.
She is the first ever Indian athlete to win a gold medal in any format of a global track event at IAAF World U20 Championships when she clocked a speed of 51.46 seconds in the 400m event in 2018.
Shot putter Tajinder Pal Singh Toor was also retained in the TOPS core group, along with Chopra and Hima, after a performance review while triple jumper Arpinder Singh was dropped from the scheme.
AFI president Adille Sumariwalla agreed with Bhanot and told Nair to take control of the national camp.
Tokyo Olympics 2020: Sprinter Hima Das not worried about qualification, focused on regaining fitness after injury
Hima, the reigning junior world champion in 400m, is yet to qualify for the postponed Tokyo Olympics and the international season has been suspended till 30 November due to the global health crisis
Country''s top sprinter Hima Das, who had a stellar 2018, has been nominated for the prestigious 'Khel Ratna' by the state government of Assam.