Any lingering doubts about Harry Kewell's participation at the World Cup appeared to have eased as Australia's star turn completed his first full training session with the national team on Thursday.

With the final 23-man squad settled and Kewell named despite his groin concerns, Australia's key attacker trained unimpeded on Thursday after nearly a fortnight being nursed through the Socceroos' two camps in Melbourne and Johannesburg.

He looked surprisingly sharp in the hit-out and came through unscathed suggesting he'll be ready to go for the tournament proper despite having played only five minutes of football since January.

Teammates are sure that if Kewell - who is unlikely to play against the US in Australia's final friendly in Roodepoort on Saturday - can return to the form he was in before groin surgery gone wrong earlier this year, he could light up the World Cup.

"Harry up until he got injured was on fire," said Socceroos midfielder Mile Jedinak, who plays against Kewell in Turkish club football.

"He was easily the in-form player in Turkey, scoring goals in all competitions, and it was a real pleasure to watch him play.

"The whole of Turkey was talking about him which was great."

If Kewell can play some role against Germany, it gives an attacking third scarily devoid of teeth in the 1-0 friendly win over Denmark on Tuesday a serious look.

With key midfielder Tim Cahill also ramping up his training, suggesting he may get more than the 45-minutes he's played in his last two friendlies when the Socceroos take on the US - Australia's two most potent attacking weapons should be front and centre against Germany in Durban on June 13.

Cahill's ability to get goals from anywhere allied to Kewell's talents has Verbeek excited at what might be.

But he cautioned the Socceroos need to be able to provide the supply for Cahill to unleash his best.

"Timmy's a special talent because he's always scoring goals, not only for Australia but for his club," Verbeek told AAP.

"He's a very good footballer with a very special talent.

"He's always at the right time in front of the goal and he's a tremendous header.

"That's a very specific quality. For us he's an important player.

"Now it's our job to bring him into the penalty box."

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