Kangaroos and Brisbane skipper Darren Lockyer says mental toughness ensured sexual assault allegations against two Broncos in the national squad did not derail Australia's World Cup campaign.

Kangaroos utility backs Karmichael Hunt and Darius Boyd, along with Brisbane teammate Sam Thaiday, were cleared by police earlier this week over the alleged assault of a 24-year-old woman in a Brisbane nightclub toilet two months ago.

The trio, who were fined $20,000 each by the Broncos for bringing the club into disrepute, had originally been overlooked by Australian selectors but Hunt and Boyd were late call-ups after injuries to Justin Hodges and Brett Stewart.

Uncertainty surrounded the pair as Australia played their three World Cup pool games, big wins over New Zealand, England and Papua New Guinea.

Asked on Thursday if he'd addressed the players as their club and national captain, Lockyer said: "They've been really good and I think (Kangaroos coach) Ricky (Stuart's) addressed all that.

"Over the last four weeks it's been about being mentally tough, whether that's Karmichael, Darius, it's the whole team.

"It's about our headspace and where we want to be each week.

"And I must say in the last three weeks it's been very good so we've just got to maintain that."

Hot favourites Australia will meet minnow league nation Fiji in a World Cup semi-final at the Sydney Football Stadium on Sunday, with the winner to play either England or the Kiwis in a Brisbane final on November 22.

Lockyer said Australia were bracing for some unsettling tactics from the Bati, whose only big NRL names are former Kangaroo Jarryd Hayne, centres Wes Naiqama and Daryl Millard and forward Ashton Sims.

"I think defensively you've really got to look to be on your toes," Lockyer told reporters.

"We're going to expect the unexpected really because there's some talented players that are going to be playing ad lib football at times.

"They're going to come to the game with nothing to lose so I'm sure they're going to try a few things to try and catch us off guard or unsettle us.

"What that's going to be, we don't know yet but we've got to be prepared."

Lockyer, a member of Australia's victorious 2000 World Cup team, said it was too early to rate this version of the Kangaroos despite their rampage through the tournament - 30-6 over the Kiwis, 52-4 over England and 46-6 over PNG.

"We haven't achieved anything yet really," he said.

"We've had some good performances but the last time I was in a World Cup in an Australian team we won the trophy and we've not done that yet.

"So this team, until it has some silverware, you can't really compare it to any.

"The talent and the attitude has been up there with the best.

"There's talent everywhere but it's their attitude and maybe that's because the NRL is such an intense, tight competition now ... they've already got that instilled in them when they come to these camps."

At pains to not get ahead of this week's task, Lockyer still said he was leaning towards England as the tournament's other finalists despite a 36-24 loss to the Kiwis last week.

"I think England are a better chance than what people think," he said.

"They started well the other night and then at halftime the coach experimented with a few players in different positions and they sort of lost their continuity a bit ... and they had a couple of other guys rested.

"I think things look a bit better for England this week."

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