Australia would have been watching the Rugby World Cup quarter-final between Ireland and Argentina with plenty of interest.

After just about getting past Scotland in their own last-eight match, the Wallabies will now face the Pumas?

But given the way, Argentina disposed of Ireland last Sunday, how worried are the Australians ahead of Sunday's semi-final showdown between the two Southern Hemisphere sides.

Last night, former Australia World Cup-winning centre Danny Herbert joined Off The Ball and Brian O'Driscoll to look ahead to the game.

"There's certainly plenty of concern but I think it's respectful concern. I think if Australia play to their potential, they'd still beat them, but the question is whether they play to their potential," said Herbert, adding that Australian fans have been surprised by how well the team has done, although he also highlighted silly mistakes in recent games.  

Listen to the full preview via the podcast: