Kevin Pietersen feels England will get struggle and that their "incredibly weak" batting line-up will be exposed in the Ashes series.
Joe Root and the rest of the touring party flew out to Australia on Saturday and will play a number a tour matches prior to the first Test which starts at the Gabba in Brisbane on November 23.
Root has enjoyed a fruitful start to the captaincy since replacing Alastair Cook, winning his opening two Test series' against South Africa and the West Indies earlier in the summer.
However, despite the positive starts, England have had to deal with off the field issues involving all-rounder Ben Stokes, who will not be a part of the squad following on from his involvement in a brawl outside a Bristol nightclub back in September.
England head into the Australian summer looking to defend the Urn that they regained in the 2015 series on their home soil.
They were whitewashed 5-0 in the 2013/14 Ashes tour of Australia, a far contrast from the one that they won Down Under in 2010/11.
Pietersen, aged 37, feels that England will face an uphill struggle to contain the Australians' over the course of the five-match Test series.
"On the last tour Down Under, the way the Australians were positive and aggressive, how they kept whacking our spinner, how Jimmy [Anderson] kept getting hit," he told ESPNcricinfo.
"[Graeme] Swann got hit regularly on the last trip and I know Darren Lehmann will probably tell them to do the same to Moeen [Ali], who is half the bowler of Swann.
"Look, I’m not saying they’re going to get absolutely hammered just because I think that for some strange reason… to back up a statement like that you just need to look at the batting order.
"Without Root or [Alastair] Cook that batting order is incredibly weak, incredibly inexperienced.
"The opening slot alongside Cook worries me, No 3 worries me, 5 worries me and 6 will worry me too if [Ben] Stokes doesn’t go. People will say one man doesn’t make a team but one bloke who bowls 140kph, gets important wickets and can smash 100 off 70 balls, is a massive player."
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