Would-be Aussie openers flunk another audition.

Australia's opening batsman Matt Renshaw is a doubtful starter for the first Test against Pakistan that starts on 7 October after taking a blow to the head while fielding in their warm-up match.

Opening batsman Matt Renshaw is set to return to the Australia side after being called up for the final Test against South Africa, that is set to start at the Wanderers on Friday.

Australia selector Mark Waugh has backed under-pressure opening batsman Matt Renshaw "to do the job" in the upcoming Ashes at home against England.