DURSLEY’S Ben Morgan has been rated as possible to make Saturday’s massive win or bust clash with Australia in the Rugby World Cup at Twickenham.

However, the chances of ex-Thornbury ace Billy Vunipola making the match are less optimistic, said England head coach Stuart Lancaster on Monday.

Both number eights are desperate to make the Pool A clash which could decide which one of them misses out on a quarter-final place after Wales’ shock victory over England last Saturday.

Morgan has a knee injury which forced him to miss the Wales defeat, while Vunipola came off midway through the match when, arguably, being one of the most effective players on the pitch, with a leg injury.

Lancaster also has fitness doubts over second row Courtney Lawes, scrum-half Ben Youngs and centre Jonathan Joseph.

The national coach said: “I would say 50-50 for all three of Billy, Courtney and Ben Youngs, although with Ben maybe slightly better, so let's call it 60-40. It's very early still," Lancaster said.

"We're optimistic on Ben Morgan. With Joseph we are going to have to wait and see how he trains or if he can train on Tuesday.

"We want to give Joseph the best chance possible because if he was fit, he'd be a guy we want in the team."

If Vunipola and Morgan are ruled out and Wood is cited and subsequently suspended, England will be facing a crisis in the back row with Chris Robshaw and James Haskell their only recognised options in the position, although Sam Burgess has played at blindside flanker for Bath.