His reign may have ended in bitter disappointment, but Robbie Deans still believes the Wallabies are capable of winning next year's Rugby World Cup.

While the juiciest reviews of Deans' five-year tenure chronicled in his autobiography, Red, Black & Gold, released on Thursday centred on his controversial sacking by the ARU, the New Zealander is philosophical about his time with the Wallabies.

And far from writing them off as a World Cup threat, he believes the Wallabies have the arsenal to upset the odds and lift the trophy in the UK under new coach Ewen McKenzie.

Even if that will almost certainly mean conquering the All Blacks, something that Deans' Wallabies could only manage three times in 18 attempts and McKenzie's charges have yet to achieve in five trans-Tasman showdowns.

"Absolutely it can be done," Deans told AAP from Japan, where he's coaching the Panasonic Wild Cats.