Injured centre Scott Williams says Wales must stay "switched on" to avoid another agonising defeat against Australia in the World Cup.
Williams was ruled out of the tournament after injuring his knee during Wales' win over England.
Following their defeat to Australia, England became the first World Cup hosts to be eliminated at the group stage, leaving the Wallabies and Wales to fight it out for first place in Pool A.
Wales have lost their last 10 matches against Australia, with the most recent five by a margin of five points or fewer and several of those as a result of late scores.
Williams has warned his team-mates they will face another tough encounter at Twickenham on Saturday.