Wallaby coach Rod Macqueen fears an international push to outlaw the use of decoy runners in front of the ball could take some variety out of rugby union if successful.

Australian teams, notably the Wallabies and Brumbies, have been at the forefront of exploring the use of decoys to deceive ever tightening defensive lines and Macqueen is adamant his team won't change its style of play for Saturday night's second Test against Argentina here.

The Australians were accused by Argentine coach Marcelo Loffreda of deliberately obstructing the Puma defence in last week's nine try, 53-6 record win in the first Test in Brisbane and were twice penalised for interference.

Macqueen said the International Rugby Board was investigating the issue but he was worried a backlash banning decoy runners would have serious ramifications for the game.

"It's very important that people don't get paranoid about this because they could change the face of rugby if they started bringing in new laws saying you can't have runners in front of ball players," he said today.

"There's speculation out that they might try to look at the laws and maybe change them to say if someone gets in between the ball runner and tackler there would be an immediate penalty. That would be a farcical situation, because if that happens you would have a very lateral game of rugby.

"You'd have no support in depth, you'd have no pick and drive, you'd have no switch plays and you couldn't pass the ball behind you in any instance."

Innovation is an integral part of the Wallaby game with Macqueen and his coaching staff forever looking at new ways to breach the defence with complex crossover moves and they are hopeful Irish referee David McHugh will ignore Loffreda's reaction on Saturday night.

Macqueen said Australia had deserved to be penalised once for interference last Saturday as an apparent worldwide crackdown against the practice takes place with referees also tough in the South Africa-England and New Zealand-Tonga Tests and Scotland-New Zealand Maori tour match over the weekend.

"These plays have been played for 100 years and it's just that right now it's becoming more and more an issue because teams like the Brumbies and Australia have done it reasonably well in recent times," he said. "We're not doing anything illegal and if we do interfere with a player, we deserve to be penalised, but we won't be playing the game any differently to how we have been."

Wallaby captain John Eales, however, was hoping for some difference in the form of improvement from last week and was also anxious to see out the entire match after a back injury forced him off in the 20th minute last week.

"You don't want to play your best game of the year in your first game of the year. At the World Cup last year, one thing we spoke about was improving every game and I think we did that. It has to be the same this year.

"They'll improve as well - we'd be very naive to think they won't improve."

Eales said he would take over the goalkicking if Stirling Mortlock had a repeat of last week's nightmare in which he missed all five attempts before handing the duties over to Joe Roff.

Australia made one forced change to last week's side with inside-centre Tim Horan replaced by Rod Kafer because of a foot injury while Argentina brought in three new faces, with veteran prop Roberto Grau, fullback Ignacio Corletto and centre Jose Orengo called up.

AUSTRALIA: Chris Latham, Stirling Mortlock, Daniel Herbert, Rod Kafer, Joe Roff, Stephen Larkham, George Gregan, Jim Williams, David Wilson, Matt Cockbain, John Eales (capt), David Giffin, Fletcher Dyson, Michael Foley, Richard Harry. Res: Jason Little, Sam Cordingley, Elton Flatley, David Lyons, Mark Connors, Glenn Panoho, Jeremy Paul.

ARGENTINA: Ignacio Corletto, Octavio Bartolucci, Jose Orengo, Lisandro Arbizu (capt), Diego Albanese, Felipe Contepomi, Agustin Pichot, Gonzalo Longo, Rolando Martin, Santiago Phelan, Ignacio Fernandez Lobbe, Alejandro Allub, Maartin Scelzo, Federico Mendez, Roberto Grau. Reserves to be named.

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