"So reverse swing's a pretty big factor, especially I'd say for the other two, Joshy [Hazlewood] presents a really good seam, we know what [Mitchell] Starcy does, but it just hasn't been a massive player so far".
The pressure will be on the Australian cricket team to come out strong and level the series.
Bouncing back from their defeat in the second Test, India thrashed Australia by 137 runs in the third to take an unassailable 2-1 lead in the series.
"I mean, in Test cricket if there is a pitch like Perth, I wouldn't want to face Jasprit Bumrah, to be honest, because once he's on a roll he can really crank it up". That's part of coaching - it's man management, looking after people and caring for people.
While Bancroft's nine-month ban expired on Saturday, Smith and Warner still have three months to serve on their 12-month suspensions. Beyond the returns of Smith and Warner, it is not hard to picture a top five featuring the banned duo, Khawaja, Harris and Travis Head.
Australia's Tim Paine followed and said the hosts were waiting to finalise their team - one of their considerations being whether the Indians played two spinners at a ground that traditionally offers something for the slow bowlers.
"Try being a selector at the moment", Langer told reporters on Monday.
They could possibly return for a one-day global in late March, when Australia have pencilled in a series against Pakistan in the United Arab Emirates.
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Their exile has left a big void in the Test team.
"The art of batting, we've got some work to do", Langer said. You can see why they're the No.1 Test ranked side in the world. Paine, who could not have imagined this time a year ago that he would be leading Australia's Test side, said that a need for stability this year while also keeping room for the suspended duo was at the forefront of his mind.
For India, the likes of Cheteshwar Pujara and Kohli will be the main focus.
"We got to refresh, be ready, and roll our sleeves up for another round", Langer said.
India captain Virat Kohli and South Africa fast bowler Kagiso Rabada have maintained their top positions in the ICC Test Player Rankings at the year-end after 2018 saw them achieve several milestones including from the rankings perspective. "Our guys are learning that, or hopefully they are learning that".
The national coach has previously referred to Australian cricket as a dysfunctional family and the past week, in which Cameron Bancroft and Steve Smith's interviews prompted debate, has done little to improve that environment.