Update from Rugby World Cup 2015: Billy Vunipola replaced by Nick Easter

Nick Easter has played 52 times for England with his last
appearance coming in the 25-20 loss to France in Paris in
August
England v Australia
Venue: Twickenham. Date: Saturday, 3 October. Kick-
off: 20:00 BST
Coverage: Live on BBC Radio 5 live, plus live text
commentary on BBC Sport website
England forward Billy Vunipola has been ruled out of the
rest of the World Cup with a knee ligament strain.
Harlequins number eight Nick Easter, 37, who has 52 Test
caps, has been called up as a replacement.
Saracens' Vunipola, 22, suffered the injury in Saturday's
28-25 defeat by Wales at Twickenham and is expected to be
out for six weeks.
Lock Courtney Lawes is a doubt for Saturday's Australia
game with a knee injury and will not train on Tuesday.
"It's so unfortunate for Billy - he's worked really hard,"
said England head coach Stuart Lancaster.
"He's committed everything to the last three months but he
is a young man with a bright future ahead of him and I
know he'll be an integral part of this team for years to
come.
"Nick was unlucky to miss out on final selection. He is a
specialist number eight and an experienced player. We
know he will make a big contribution."
Easter said he was driving to training with Harlequins when
he was told he was being called back into the England
squad.
"The management said I was on standby and that
anything can happen," he added.
"It's very unfortunate for Billy. He played very well
against Wales and was a star of the Six Nations."
England have played two games in the World Cup - a 35-11
win over Fiji and Saturday's loss to Wales.
They are third in Pool A and face Australia at Twickenham
on Saturday and Uruguay a week later, with the top two
progressing to the quarter-finals.
"The players are looking forward to the biggest week of
their lives. It's knockout rugby from here on in," said
Easter.
Centre Jonathan Joseph, who missed the Wales defeat with
a chest injury, is "making very good strides and ticking all
the boxes", according to backs coach Andy Farrell.
Scrum-half Ben Youngs is "making progress" on a swollen
ankle, but will also not train on Tuesday, although number
eight Ben Morgan is "fully back" into training.