Australian opener Phil Jaques will miss the rest of the Indian tour because of a back injury, Cricket Australia (CA) announced on Friday.
Team bosses said the 29-year-old left-hander, who has not played on the tour so far, was being sent home to help him recover in time for the upcoming domestic season.
"Phil has had a long-standing problem with his lower back that has been manageable up until now," team physiotherapist Alex Kountouris said in a CA statement.
"The point has come where the injury is significantly limiting his ability to play, so he will return to Australia to seek specialist opinion on the best course of action."
Chairman of selectors Andrew Hilditch said Jaques' replacement for the final two Tests against India would be named soon.
"This is obviously disappointing news for Phil," said Hilditch. "We're hoping the treatment is successful and he can return to cricket as soon as possible.
"The selectors will be making a decision in a few days' time as to Phil's replacement on this tour."
Jaques, who made his debut in 2005, has so far played 11 Tests and scored 902 runs, at an average of 47.47 with three centuries.
He has also scored 125 runs in six one-day internationals.
Jaques is the second player in the squad to have his tour cut short through injury. Leg-spinner Bryce McGain also went back to Australia and was replaced by Cameron White.
The first Test in Bangalore ended in a draw, while the second Test opened in Mohali earlier on Friday.
The remaining two Tests will be played in New Delhi (Oct 29-Nov 2) and Nagpur (Nov 6-10).