Alastair Cook's England captaincy faces a "defining moment" in Perth, according to Shane Warne.
Cook takes his side to Australia's west coast with their Ashes defence in desperate trouble following a second, heavy defeat of the series in Adelaide.
England were beaten by more than 200 runs for the second Test in succession - just the second time that has happened - and another defeat in Perth would return the urn to the Australians after a seven-year absence.
The omens are not good for the tourists, who have lost their past six Tests at the WACA and must deal with the in-form Mitchell Johnson on Australia's quickest surface, and Warne reckons drastic measures are required to halt the slump.
He told Sky Sports News: "It's hard to see a way right now where England can come back. They don't play very well in Perth, and Australia are on a roll and they do play well in Perth.
"It's going to be fast and bouncy, and quick, we've seen Mitchell Johnson thunderbolt, so unless something changes really quickly for England - let's all hope it does - unfortunately I can only see one result in Perth.
"England have got to show they're up for it and I hope Alastair Cook eyeballs every one of his players and says 'are you up for it? What have you got? Have you got your best game in Perth? Are you ready to play and take these guys on?'.
"That has to be him, so it's a real defining moment for me, to watch Alastair Cook do that and the players, the experienced players, need to stand up."
Warne's fellow Sky Sports pundit David Lloyd says it is down to coach Andy Flower to rethink England's strategy - and fast.
"They're a distant second and they've got to start again at Perth in just a few days' time," he told Sky Sports News. "They've got to come up with answers.
"If you look at both coaches, Darren Lehmann will be absolutely thrilled. He'll get a pizza, have a couple of beers and a sing-song.
"If you look at Andy Flower, he's got sleepless nights to come up with a formula, with a combination, because he needs to win two Test matches."
Can England keep their Ashes defence alive? Watch the third Test from Perth live on Sky Sports 2, starting this Friday at 2am