Rocky Elsom says the Wallabies must cope with the "unique" pressures of Croke Park if they are to conquer Ireland on Sunday to keep their grand slam hopes alive.

In one of the most memorable days of his career, Elsom led Leinster to a stirring European Cup semi-final victory over Munster at the ground earlier this year and says playing in the enormous arena is something else.

Croke Park houses 82,000 fans and is certain to be packed to the rafters on what shapes as an emotion-charged weekend for Dubliners.

Ireland take on France on Saturday for a berth in next year's soccer World Cup before Brian O'Driscoll captains Ireland in his 100th Test the following day against the Wallabies.

"You need to address the noise element because, compared to the crowds we get in Australia, it's very loud," Elsom said on Sunday after returning to Dublin for the first time since his European Cup heroics.

"The noise coming out of the place was deafening the whole game (against Munster).

"If we were on the field together, we'd have to be so close and you'd have to be watching my mouth to hear what I was saying.

"We'll address that, but that's not too hard. You just need to make the players aware of it and we should be fine. Hopefully they don't make too much noise."

Elsom says the massive Gaelic Football ground is like no other the Wallabies will ever experience in world rugby.

"It's very different to Lansdowne Road," he said. "It's different to Newlands (in Cape Town).

"It's just so much bigger and there's a lot of people in the stands obviously, but the actual field itself is quite big.

"It feels like a much bigger stadium. Well, it is. It's a much bigger playing field. It has a different feel about it as well.

"It's pretty unique ... it's pretty good. I don't know if overwhelming's the word but the fans certainly get stuck into it."

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