England flanker James Haskell has said that England need to improve if they are to progress at the World Cup.
Martin Johnson's side edged out Argentina 13-9 on Saturday, but have been subject to criticism for their performance.
The 2003 winners face Georgia next Sunday, and Haskell knows their opponents will fancy an upset.
"Anything can happen in this World Cup and Georgia are another side who would love to take England out," he said.
"Everyone's going to be heartened by this performance by Argentina. With Georgia it's going to be another set of very, very big men.
"We have got to be accurate, get our defence on the money and really impose ourselves and just stick with it."
He added: "We've just got to make sure we make some changes this week."
Haskell has made 33 appearances for the national side since his debut in 2007.
