Pakistan's fielding will tell Shane Warne what sort of opposition Australia face in their Test series.
The legspinning legend and prominent cricket commentator has warned the home side not to be complacent when the Test series starts on Thursday at the Gabba.
But Pakistan are notoriously inconsistent and Warne says their performance in the field will be crucial.
"The key for Pakistan, for me, is their fielding - it's a barometer for them," Warne said.
"If their fielding is on and they hold their catches, they field well and they have intensity ... you know they're switched on.
"If they start misfielding, if they start dropping catches and fumbling, you know they're with the fairies and always looking after themselves.
"So (if) Pakistan are fielding well, look out Australia."
Speaking at a President's Cup golf event in Melbourne, Warne said the Pakistan pace attack looked promising.
"Pakistan always produce some great young players - young batsmen, but especially young fast bowlers," he said.
"I think Waqar Younis was 16 on three tours when he came here. He never aged.
"But they have a couple of good 17, 18-year-old kids here who will bowl fast. They'll enjoy probably the bounciest pitch in Australia as well.
"They'll be a good challenge for Australia - if Australia are complacent in any way whatsoever, then Pakistan will bite them because they're a good side."
While Warne liked the recall of Australian opener Joe Burns, he thought Marcus Harris deserved another chance and was surprised Cameron Bancroft was also in the Test squad.
"Joe Burns, I like that selection," he said.
"I'm a little surprised with Cameron Bancroft being in the squad ... after his form in England."
He also likes the look of Victorian teenager Jake Fraser-McGurk, after his first-class debut last week wearing Warne's favourite No.23.
"Hopefully, he does the No.23 proud," Warne said.
"I thought it's fantastic he wanted to be No.23 ... he's off to a great start."
Australian Associated Press