Natarajan suffered a shoulder injury as well as a knee niggle that had ruled him out of the first couple of games of the five-match series.
The prime minister said that the tea workers and each individual who drinks tea will seek an explanation from the political parties for maintaining silence on it.
The association said it also expects that the tea estate population would be provided a more comprehensive coverage on welfare schemes related to housing, education, sanitation and medical facilities.
India chased down 328 in the final Test to end Australia's 32-year unbeaten run at the Gabba, Brisbane.
Set to play in the second Test against an in-form Australian team, KL Rahul had a long hit at the nets, and so did Rishabh Pant.
'Don’t believe me? Ask Ashwin and Natarajan', Sunil Gavaskar cites 'different rules for different players' in Indian dressing room
Gavaskar added that Natarajan has been forced to stay back only as a net bowler even though the limited-overs series, of which he was a part, ended almost a fortnight back.
The new drills were introduced to add to the team spirit and ease the pressure going into India's first pink-ball Test against the Aussies.
Rahul has now pipped specialist wicketkeepers Rishabh Pant and Sanju Samson as the no.1 glovesman in the limited overs format.
Secretary-General of Indian Tea Association Arijit Raha said that the decision to give 20 per cent bonus to the north Bengal tea garden workers was taken on Friday night.
Importers from Pakistan have been sourcing low quality tea from India to be mixed with the tea they import from countries like Kenya, as it gives them a better margin.
Virat Kohli said he respects Anil Kumble's decision to quit as coach and that there is highest regard for him as a player.
Dravid said that time has come to also decide on the spin combination with finger spinners Ashwin and Jadeja.
The four top-ranked Test teams: India, Pakistan, Australia and England are separated from each other only by 10 points.