England have suffered a major injury blow just two days before their World Cup quarter-final against Australia with centre Andy Farrell ruled out with a strained right calf muscle.

Farrell, who was recalled to the side after being dropped following the record 36-0 defeat by South Africa last month, underwent an MRI scan this morning.

England head coach Brian Ashton will not announce Farrell's replacement until tomorrow lunchtime.

Ashton, though, would appear to face a straight choice between promoting Olly Barkley off the bench or recalling 36-year-old Mike Catt for his first appearance since the South Africa drubbing.

Barkley had a poor game defensively against Tonga six days ago, while Catt offers considerable experience and is a survivor of England's successful 2003 World Cup campaign.

The loss of Farrell is a cruel blow both to the player and his team, with Ashton having selected him for the "direct approach" he would have brought.