Wales coach Graham Henry has begun the war of words ahead of this weekend's clash with the Wallabies by accusing coach Eddie Jones of employing illegal decoy runners.

It's not a new allegation but Henry claimed use of runners in front of the ball had become more prevalent since Jones took over Wallabies four month ago and wasn't normally allowed by northern hemisphere referees.

Henry's verbal attack, five days before Wales attempts to inflict on the Wallabies a third consecutive Test defeat for the first time since 1995, had an element of payback.

As coach of the British and Irish Lions in Australia earlier this year, a livid Henry claimed Jones, then coaching the ACT and Australia A, was the chief lieutenant of an Australian campaign to influence the referees and unsettle the tourists with claims of foul play and illegal tactics.

Jones and NSW coach Bob Dwyer attacked the Lions' play in tour matches before the Tests and Henry accused them of acting under instructions from Wallaby boss Rod Macqueen.

This time the British coaches are ganging up.

Two weeks ago, England coach Clive Woodward claimed Australia's tries in their 21-15 loss to his team came from using illegal decoy runners.

Henry followed up today, saying Australia's tries in both the England game and last week's loss to France came off dubious moves which he repeatedly asserted were not tolerated by northern hemisphere whistleblowers.

"There's more behind the player passing (by the Wallabies) than six months ago which is a bit of a concern because it's not allowed in this part of the world," Henry said at a press conference where he named three forced changes to his team for the Test.

"In the last two games, Australia scored tries from passes behind the player.

"There's more emphasis on that now than when we toured with the Lions.

"There'll be a different emphasis on defence for us because we need to look at it more than we normally do, not only because Australia are very good, but because they play the game differently.

"Nobody does that in this part of the world because they get blown (penalised).

"It makes it easier to attack if you play it that way. We don't do it here because we get blown, so there's no point doing it."

The Wallabies have been surprised and battered by the strength and pace of the England and France packs with French flanker Olivier Magne even claiming the Australians have lost their tough edge.

Henry admitted all his struggling Welsh team wanted to do on Sunday was provide a contest for Australia but hinted they would at least follow their European colleagues and take the world champions on up front.

"I think the game's a lot more physical in the northern hemisphere than the south," Henry said.

"They also play 40-odd games a year, so they smash each other around for a long time. They get used to the physicality of it."

Injuries to Anthony Sullivan, Allan Bateman and Iestyn Thomas suffered in last week's win over Tonga forced Henry to bring in winger Wayne Proctor three years after his last Test as well as outside centre Jamie Robinson and prop Spencer John off the bench.

The Australians, desperate to finish the tour with some credibility, trained in private today while Jones was giving them tomorrow off. (AAP)