Argentina centre Jeronimo de la Fuente insisted the South Americans are not underestimating Australia following their quarter-final performance.

The Wallabies were not at their best against Scotland last week, requiring a controversial last-gasp penalty to claim a 35-34 win at Twickenham.

Australia captain Stephen Moore was quick to demand an improvement following the quarter-final scare but Argentina, who stunned Ireland 43-20, will not be treating the Wallabies any differently heading into Sunday's semi-final.

"They may have had a bad day, but we cannot base our preparations on that match," De La Fuente told reporters.

"Australia are a great team and have the ability to attack in the last minute thanks to the quality of the players they have.

"Still I hope we play as well as Scotland did."

De La Fuente added: "We must hold on to the ball well because that is what we did in the last match.

"It will be a major battle, regardless of who is winning and it gives the scrum-half cleaner ball to attack with."