Wallabies will have to improve – Cheika

Michael Cheika admits his Wallabies should have been a bit more pragmatic as they were pushed all the way by Argentina on their way to reaching the World Cup final.

Australia scored four tries in all during their 29-15 win, with Adam Ashley-Cooper grabbing a hat-trick after Rob Simmons' opener in the second minute.

However they led by just seven points heading into the last ten minutes as they struggled to put away an Argentine side that couldn't quite break through despite 13 clean breaks.

"I'm a massive fan of the Argentinians and the way they are playing the game now," said Cheika.

"You've got to pay a lot of credit to the coach who is backing his players to play running football and they're testing you all the time. If you give them plenty of ball, you get weary defending.

"We kept the ball in the field of play when we should have stopped the game a little bit and should have reset.

"We lost some line-out ball as well, so we started going without the ball. At this level in the semi-final of a World Cup, if you work without the ball you probably pay for it.

"Towards the end of the game we started getting the ball back a bit so we were able to get a score."

Australia will now play New Zealand in the final next Saturday at Twickenham, as both sides aim to become the first team to win the World Cup on three occasions.

The Wallabies were the last team to beat the All Blacks, but have really struggled overall in recent seasons, and Cheika admits his team will have to improve once more.

"New Zealand have had a very different path to us to here," he added.

"They'll be feeling a bit differently in their preparation but it's a World Cup final and the adrenaline will be pumping so anyone who is feeling a bit sore will forget about that.

"Obviously we believe in ourselves to go out there and to do our absolute best. I don't want to look back at things. If I start looking back at the one win, I'll have to look at the nine losses. I want to look at Saturday and how we're going to play as well as we possibly can."