Sydney: Michael Clarke fears his career could be over after he sustained yet another hamstring injury in Australia's first-Test victory against India on Saturday.

Australia's enthralling 48-run triumph was soured by the injury to captain Clarke, who pulled up while stooping to field the ball in the final day's play and left the Adelaide Oval to have scans on his right hamstring.

The 33-year-old batsman was an injury doubt going into the first Test which was rescheduled and relocated to Adelaide following the death of batsman Phillip Hughes 16 days ago after he suffered a separate hamstring injury during the recent one-day international series against South Africa.

Clarke admitted that he was a doubt for the remainder of the four-match series immediately after the match, before declaring that he might have to give up the game altogether in a post-match press conference.

"There's a chance I could never play again," Clarke said. "I hope that's not the case and I'll be doing everything in my power to get back out on the park, but I think I've got to be realistic as well."