Origin I

Queensland's Cooper Cronk will decide his own fitness hours out from series opener

Cronk surprised onlookers on Tuesday when he ran out with the Maroons' squad for their only training session at Sydney's Olympic stadium ahead of the State of Origin opener.

While he is not certain Cronk would be fit to play, Walters remains confident the half-back would make the cut - but the final call will be left to the man himself.

"I will let Cooper make the call. He is big enough to work out whether he can get through 80 minutes of Origin," Walters said.

"He's quietly confident he can play. But tomorrow, we have to make a decision," he said.

NSW Blues side named for Origin I

Five debutants have been named, with Tyson Frizell, Josh Mansour, Matt Moylan, Adam Reynolds and Dylan Walker to have their first taste of State of Origin football if selected in the final side.

Panthers forward Bryce Cartwright was initially added to the squad a development player, but was subsequently removed from the squad due to a thumb injury. An announcement is yet to be made regarding his replacement.

Coach Laurie Daley is yet to finalise his starting line-up and final 17, with the extended squad selected below.