Kurt Gidley is confident he'll be involved in full training with his NSW State of Origin teammates later this week after missing Newcastle's weekend win over Sydney Roosters.

The Knights' skipper is one of three doubtful players included in Ricky Stuart's 20-man Blues' squad, after tweaking his hamstring in training on Friday.

However, the 29-year-old utility believes missing the 18-10 victory over the Roosters was precautionary, and the NSW physios and medics at Newcastle have been encouraged by his recovery.

"Obviously it wasn't ideal hurting the hamstring at training the other day, but it has come along pretty good and all the physios say it should be fine," Gidley said.

"I've seen our physio in Newcastle and the one here in camp and they are happy with how it has progressed after the past two days and I am really confident it'll be right.

"I will hopefully be running by tomorrow (Tuesday). I'll do some training with our physio and I'm confident I'll be fine."

Gidley said Wednesday week's Origin decider in Brisbane would be his biggest game and he'd be devastated to miss out.

"Over the past three days it has progressed well, but I knew on Friday the injury was not a major thing, but it was disappointing to miss yesterday's game against the Roosters but it was the right decision," he said.

"This is no doubt the biggest game of my career, I haven't played in a grand final, this is my grand final. I have been playing for a while now and these are the games you want to be involved in.

"Every State of Origin game is big, and this is probably the biggest in Origin history."

Another player hopeful of making the 17-man squad for July 6 is Michael Jennings, who missed the 18-8 Origin II win in Sydney, after a strong performance in the series opener in Brisbane.

The Penrith centre has been sidelined since round 13 with syndesmosis and, despite missing the Panthers' 30-20 win over North Queensland on Sunday, is hopefulof travelling with the team.

"I haven't had a run yet. I'll know by the end of the week if I can can play. I've been seeing doctors and physios at Penrith to try to get things done and give myself the best chance I can to play."

Encouragingly for Stuart, the Panthers' medicos have told Jennings his injury is healing quicker than they first thought.

"I was re-assessed last Friday and they said that the recovery had gone better than they had thought, so the doctor has pushed back my return date to the week of Origin.

"But I have to make sure I am at 100 per cent here in camp, as I can't go into the game half-hearted."

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