"Rishabh Pant has got a concussion after being hit on his helmet while batting. KL Rahul is keeping wickets in his absence. Pant is under observation at the moment," BCCI said in a statement.
Pant scored 28 off 33 balls and hit two fours and a six before getting caught towards point by Ashton Turner off Pat Cummins.
India were bowled out for 255 despite Shikhar Dhawan's 74. Australian pacers led by Mitchell Starc (3/56) kept taking wickets at regular intervals to keep the Indians in check.
Besides Starc, Pat Cummins (2/44) and Kane Richardson (2/43) took two wickets each with spinner Adam Zampa (1/53) and Ashton Agar (1/56) scalping one apiece.