Fringe player Anthony Milford has run Queensland's attacking plays at training as the Maroons sweat on halfback Ben Hunt's fitness ahead of next week's State of Origin opener at the MCG.

Hunt was restricted to light duties at Thursday's first session at their Gold Coast camp due to a thigh problem and looks set to be given until Sunday to prove his fitness.

Lock Josh McGuire (ankle) and fullback Billy Slater (hamstring) - ahead of his final Origin series after announcing his representative retirement - were eased through into training after sprint drills.

The veteran pair look certain to play June 6's Origin opener in Melbourne.

But St George Illawarra playmaker Hunt appears the biggest concern after being restricted at training wearing a thigh guard.

He only took part in the final 10 minutes of the two-and-a-half-hour session.

Brisbane Broncos half Milford took over the Maroons' attacking drills after arriving as one of six development players brought into Queensland camp on Thursday to assist them through their fitness concerns.

The others are Dale Copley, Brenko Lee, Moses Mbye, Joe Ofahengaue and Jaydn Su'A.

Brisbane forward Ofahengaue is believed to be the official 18th man.

Coach Kevin Walters has called in the additional players to give them a taste of Origin as he plans the biggest overhaul of the Queensland team in at least a decade.

The Maroons are starting life without skipper Cameron Smith, Johnathan Thurston and Cooper Cronk while veterans Matt Scott and Darius Boyd were overlooked for game one - a total of 150 games' worth of Origin experience.

Maroons forward Josh Papalii was confident their injury concerns would play Origin I.

"He (Hunt) is all good. He could have trained today but we have got the physios and doctors working on him but I would say he is alright to play," he said.

The first training session at Camp Maroon at Sanctuary Cove also provided another kick-off between Valentine Holmes and Dane Gagai.

Cronulla's Holmes - who has played just two Origins - is expected to take over the goal-kicking duties in the absence of Smith and Thurston.

But Holmes believed South Sydney recruit Gagai - who has played seven Origins - may take the role in game one despite having only a 43 per cent NRL goal kicking success rate.

"I am happy to take it but if Gags wants it he can take it. He has played longer, he has been in more occasions like that," said Holmes.

"If he feels he can take the pressure I am more than happy for him to take it."

Holmes said Thurston's pressure sideline kick that sealed victory for Queensland in game two last year gave him an indication of exactly what was expected from whoever got the gig on June 6.

"I haven't thought too much about the pressure but we all saw JT kick that goal in the second game just like he has done a thousand times," he said.

"We have big shoes to fill (as goal kickers) with Smith and JT gone.

"We are going to have to kick them all because we will need them."