Ashwin injured himself on the fourth evening of the Adelaide Test, and he further aggravated the injury as Australia kept India on the field for nearly the whole fifth day, before the visitors sealed their first win of the series.
"The way he bowled in this Test match was outstanding", said India captain Virat Kohli, whose side will retain the Border-Gavaskar Trophy.
Since the vacancy in the team is created by Rohit Sharma going home to be with his wife and their new-born first child, a daughter, Kohli might even think of getting a batsman, thus gambling one final time with either Lokesh Rahul of Murali Vijay, pushing Hanuma Vihari to No 6 in the order.
"Having Mitch there played a massive role".
Cummins' view that reverse swing was largely absent during Australia's 4-0 trouncing of England is in sharp contrast to Stuart Broad's recollection of the tour.
Cricket Australia's top management has undergone an overhaul in recent months in the aftermath of the ball-tampering scandal in March.
"Regardless of it being the last Test match, he will be willing to push himself and start for the team - but again it depends on what kind of pitch we get in Sydney". "I don't understand why they have changed their method for this one game". Although they lost the series against the Proteas, debutant Jasprit Bumrah made a mark on the series and carried on his good form throughout the year.
Captain Tim Paine admitted on Sunday it was "pretty clear" they were being missed, with no batsmen other than tailender Pat Cummins scoring more than 50 in Melbourne. We didn't enforce the follow-on because when our bowlers bowled in those two sessions, it was really warm out there. "But he stepped down [in October] and there has been no further contact".
Steve Waugh and Shane Warne headline the greats to have condemned Cricket Australia for devaluing grade and Shield cricket, a topic covered in The Ethics Centre's independent report.
They were joined by the majority of Australia's top order, with the quicks - including Marsh - taking the morning off alongside Shaun Marsh and Travis Head.
Australian batting is under vast scrutiny after quick Pat Cummins turned up the best performance with the bat for the Australian team and with leg-spinner Marnus Labuschagne added to the squad, Australian greats have called for Aaron Finch to be dropped.
The 25-year-old paceman produced career-best performances with ball and bat in last week's third Test against India, claiming match figures of 9/99 and compiling a technically sound 63 in the second innings. "And he's doing what he can to get over that injury", Kohli said.
"The art of batting, we've got some work to do", Langer said. "We will see how they line up", he added.