I know we won't be favourites. That's no reason not to try and go and win it. Let the dice roll. I don't think you should leave anything in your locker in the World Cup. You should put your best foot forward every time and that is what we have done.
O'Sullivan believes the return to the side of Irish born Keith Gleeson, who learned his rugby in Australia can be a plus factor for Ireland.
Keith is a very good open side flanker." the coach said. " He also knows some of the Aussie boys. He played with them on the way up. I think he will want to prove a point, which is always a good way to go into a game.
O'Sullivan told a huge media conference that he felt less pressure going into Saturday's game compared to the match against Argentina. We are now already in the quarter finals of Rugby World Cup and we said that was our goal. Now that we're there we want to get to the next stage. Winning last Sunday will keep the momentum that we have built up. It would be a great step forward for Irish rugby if we could pull off a win against Australia in Australia. It has not happened in a long time.
As to the selection of Ronan O'Gara at out half, O'Sullivan said,
Ronan came off the bench last week and did a good job and he gets the nod on form this time.