Clint McKay has been added to Australia's Test squad due to lingering concerns over the fitness of Ben Hilfenhaus.
McKay, 27, is already in England playing county cricket for Yorkshire and will join up with his countrymen ahead of the second Test against Pakistan, which starts at Headingley on Wednesday.
The Victorian has made just one previous appearance in the five-day format, recording figures of 1-101 against West Indies at Perth last December.
He most recently took part in Australia's 3-2 one-day international series loss to England before being released to play for Yorkshire.
Hilfenhaus injured his left shoulder attempting a diving save on the fourth and final day of Australia's 150-run victory over Pakistan at Lord's.
Team physio Alex Kountouris has since been working with the Tasmanian and Australia remain hopeful he will have recovered from soreness by Wednesday.
"I don't think he bowled today, he is still seeing the physio, but he is certainly improving," said vice-captain Michael Clarke on Monday when asked about the status of Hilfenhaus.
"He has had a few niggles over the last couple of years so he will disappointed if he misses the Test match.
"He is in good hands with Alex, our physio, he knows what is going on.
"He has spent a lot of time with Hilfy over the last year or so, so I think he will get him on the park.
"Hopefully he will be right come day one of the Test match."
George on stand-by
If Hilfenhaus is unable to hold his place, it is anticipated that South Australian paceman Peter George will make his Test debut.
George was a late addition to the squad when fast bowler Ryan Harris was struck down with a knee injury during the fifth one-day international against England.
Marcus North, the unlikely bowling hero at Lord's with 6-55 in the second innings, also missed training on Monday due to an upset stomach.