They were kept in the Test squad for the series starting on December 17 but tough quarantine rules have made their availability uncertain.
Ratra picked Rahul over Pant and Samson because of the form he is in.
Siraj also revealed his conversation over the phone with his mother who wished him the very best.
His brother also recalled how the 26-year old pacer had called up his father after getting picked for the Australia tour.
He also backed Prithvi Shaw as the back-up opener and KL Rahul as the fourth choice for opening.
Kohli will be returning to India after the first Test against Australia.
Gavaskar feels there is nothing to worry about as the team tends to raise their game during the regular skipper's absence.
Langer expressed his 'respect' for Kohli for putting his family ahead of the game.
Rohit Sharma will not feature in the limited-overs series, but would be available in the red-ball format for the Border-Gavaskar Trophy.
Like most aspiring cricketers, his career also started in the streets where he bowled with the tennis-ball.