Shreyas Iyer has been ruled out of the Ahmedabad Test, with the BCCI saying on the fifth morning of the match, that "a specialist opinion will be sought" to treat his lower-back injury.
On Sunday, the fourth day, as India tussled for first-innings honours with Australia, Iyer couldn't come out to bat, with the BCCI saying that he had been sent for scans after he "complained of pain in his lower back following the third day's play". India finished on 571 for a lead of 91. ESPNcricinfo understands Iyer was not present at the ground at any point on Sunday.
The injury will particularly worry India since back trouble has dogged Iyer over the last few weeks: it kept him out of the first Test of this series, as well as the three-match ODI series against New Zealand that preceded it.
After this Test match, Iyer's next assignment is to captain Kolkata Knight Riders in the IPL, which begins on March 31. Knight Riders are scheduled to play their first match of the tournament on April 1, against Punjab Kings in Mohali.