NSW Waratahs centre Rob Horne is intent on impressing Wallabies coach Robbie Deans with his "mongrel" qualities in Thursday's make or break intra-squad trial.

Horne, who could be a bolter in the grand slam tour squad, has fully recovered from a hamstring injury after carefully monitoring his workload throughout his first Wallabies training camp this week.

The 20-year-old took part in a full session on Monday, took on light duties on Tuesday and pulled up well after Wednesday's final run - just in time for the refereed probables versus possibles "trial" at St Ignatius College in Sydney.

Horne is hoping to make the step up to Test level and believes he has the qualities Deans values in his players.

"I definitely like to play physically, I like defence and putting big shots on and stuff like that, I guess that's mongrel but it's just how I've always played," Horne told AAP on Wednesday.

Those qualities saw Horne become a regular in the Waratahs starting XV last Super 14 season in just his first year out of high school.

Deans has split his extended 43-man squad into two sides and has stressed each position is up for grabs heading into the Wallabies first grand slam tour in 25 years, which will follow a Test against the All Blacks in Tokyo.

The Kiwi-born coach, who has called for his Wallabies to show more desire and passion, will cut eight players after closely monitoring the trial and name the 35-man touring party on Friday.

Horne has been running with the possibles backline alongside Waratahs teammate Kurtley Beale, Quade Cooper, Ryan Cross and Drew Mitchell.

The former Australian schoolboy and under-20s representative has been training at outside centre and out of position on the wing.

He will likely come up against incumbent centre Adam Ashley-Cooper, Super 14 standout Digby Ioane and sevens halfback Richard Kingi, who has filled in on the wing, on Thursday.

Horne said the probables side was not unlike Australia's Tri-Nations team and he was looking forward to the clash, which is open to the public.

"It's an ideal situation for us young guys coming through to be given the opportunity to play directly against the guys that you're trying to make the squad with," Horne said.

"They're the best players in Australia that you're playing against.

"It'll be fiery and everyone will be putting everything into it because (selection) does come down to how you perform and, if you perform, then hopefully you think you'd get a go."

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