Pakistan captain Inzamam-ul-Haq has ruled himself out of the second test against Australia starting on Sunday due to a back injury.

"I have been advised to rest for three weeks by doctors. My back is sore and hurting," he told Reuters by telephone after undergoing medical tests.

Inzamam said he was not yet sure about playing in the third and final test in Sydney. World champions Australia won the first test by 491 runs.