Halfback Cooper Cronk has been going to extreme lengths to make sure he’s fit for State of Origin III.

Melbourne coach Craig Bellamy says halfback Cooper Cronk has been experimenting with “potions and lotions” in a desperate bid to prove himself fit for State of Origin III.

Both Bellamy and Queensland captain Cameron Smith were unsure if Cronk’s fractured arm will have healed in time to turn out for the Maroons next Wednesday night, with a final scan set to determine his availability.

Queensland’s loyalty to players who have served them well over time suggests they may pick Cronk in an extended squad on Tuesday and then give him every chance to prove his fitness for the dead rubber at Suncorp Stadium.

Cronk has completed light contact sessions in Melbourne and is keen to play, with Bellamy revealing his No.7 has as always, left no stone unturned with his recovery.

“He’s been getting into a few potions and lotions with his diet to try and heal the bone quicker,” said Bellamy.

“He would have done all he could. Not sure what he’s ben eating or taking into his body but I think it’s been a lot of stuff you’d think is yuck. But that’s him.

“He’s so committed and so determined. I wouldn’t count him out.”

Bellamy said he hopes Cronk doesn’t take any risks, with Monday night’s 24-12 loss to St George Illawarra an illustration of how much the Storm have missed their chief playmaker since he suffered the break in Origin I.

Smith said the fact there was still eight days until the third Origin gave Cronk a fighting chance of replacing Daly Cherry-Evans in the starting side.

“Still a long way away which is a positive for him,” he said.

“He’ll go have another scan and see how the fracture is going. If he’s available that’s great for us but if not we’ve still got some quality halves.”

Bellamy and Smith said centre Will Chambers is ready for an Origin call-up, with the 26-year-old in line for a Maroons debut in place of the injured Brent Tate.