Krejza suffered a torrid time in the first test against South Africa
Australia have dropped spinner Jason Krejza from their squad for the second Test against South Africa.
Krejza, 25, had figures of 1-102 and 0-102 as Australia suffered a six-wicket defeat in the first Test.
A Cricket Australia statement said: "In Perth we were unable to maintain pressure at the spinners' end.
"Jason has been encouraged to continue to be a wicket-taking bowler. But he will return to interstate cricket to further those skills."
Off-spinner Nathan Hauritz and seamer Ben Hilfenhaus have been added to the squad.
The statement added: "We were impressed with Nathan Hauritz's bowling in the second Test against New Zealand, where he maintained pressure and took wickets and deserves his recall.
"We're also adding Ben Hilfenhaus to the squad. Ben has been added primarily because of his ability to swing the ball. He also adds depth as a new ball bowling option."
Australia squad for the second Test against South Africa, starting on 26 December:
Ricky Ponting (capt), Michael Clarke, Brad Haddin (wk), Nathan Hauritz, Matthew Hayden, Ben Hilfenhaus, Michael Hussey, Mitchell Johnson, Simon Katich, Brett Lee, Peter Siddle, Andrew Symonds, Shane Watson.