Socceroos striker Tim Cahill is expecting the Chileans to try and put him off his game with some underhanded tactics when they clash in their World Cup opener on Friday (Saturday AEST).

The Socceroos had their first partially closed training session on Wednesday since arriving to Brazil as they try to fine-tune their gameplan for their crucial first clash in Cuiaba, Brazil.

All 23 squad members have all been declared fit and were all at training on Wednesday with veteran playmaker Mark Bresciano, who has been battling a back complaint, a likely starter.

“The way Mark Bresciano has been training, I feel that he looks confident,” Cahill said.

“There’s 23 players that are ready to go and I’m hoping that Bresc is one of those.”

Cahill, Australia’s biggest threat up front, will start at the point of attack against Chile with Tommy Oar set to be on the left wing and Mathew Leckie on the right.

With Cahill’s aerial advantage, the veteran striker is prepared for a bit of rough and tumble play from the Chileans in the box.

“I know for a fact that they’ll have someone, or a few holding and shirt pulling and things like that to put me off my game. But that’s no different to what I’ve had in the past,” he said.

“It’s a competition where a little nudge can change the way you head a ball or the way you attack a ball or even defend a ball.

“So it will be no different to the way we’re going to be and for us we’re up for every single battle. We’re going to stand up and be counted.

“Hopefully the referees clamp down on it this campaign.”

Chile’s key midfielder Arturo Vidal is set to miss the clash with inflammation on his knee after having surgery last month.

The Juventus star was reported to have re-joined team training on Wednesday and appeared to be moving well.

Cahill said he wouldn’t be surprised if creating doubt about Vidal’s availability was just a tactical move from coach Jorge Sampaoli.

“It may be a tactical advantage for them, maybe he’ll show up on the day and play,” Cahill said.

“So for us we have to worry about ourselves. Vidal is a player that brings a lot to their team but at the same time, whoever steps in can do just as good a job as he can for Chile.”