Powerhouse back-rower Wycliff Palu has declared himself a 90 per cent certainty for the Rugby World Cup after making strong progress from a nagging shoulder injury.

Palu resumed training with the Wallabies this week after being sidelined for a month with nerve and ligament damage which has caused instability of his right shoulder.

After completing some contact work without discomfort, Palu trained with the rest of the squad at Manly on Tuesday and said he was optimistic about making the trip to France for his first World Cup campaign.

"At the moment, I'm feeling pretty confident and, if it keeps improving, I'll be on that plane," Palu said.

"If you look right across the board in the back row, there's a lot of competition so you'd want to be a hundred per cent right to go to the World Cup.

"I'd say I'm 90-10 (in favour). Two weeks ago, I was probably maybe 60-40."

Palu will be asked to prove his fitness with a couple of appearances for Central Coast Rays in the new Australian Rugby Championship.

He will play 40 minutes against the Sydney Fleet at North Sydney Oval on Friday week and then try to play the full 80 minutes against the Western Sydney Rams at Gosford the following Saturday.

That the hulking 25-year-old is back on track - just a day after Australian coach John Connolly rated him a more doubtful World Cup starter than fellow No.8 David Lyons - is encouraging news for Wallabies fans.

And Palu's progression is even more significant given Lyons had to re-enter hospital to receive further treatment for the blood clot in his leg which ruled the 43-Test veteran out of Australia's final Tri Nations match against New Zealand 11 days ago.

Diagnosed with Deep Vein Thrombosis, Lyons already spent last Thursday night in hospital ahead of surgery the following day.

But the Wallabies insist he was always scheduled for a second round of treatment to help speed up the recovery process.

Lyons is due out on Wednesday and will rejoin the squad on Sunday for a five-day commando-style camp in Brisbane with the BLP group - ex special forces from the police tactical unit who also worked with the Australian cricket team before they won this year's World Cup in the Caribbean.

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