AAP

Hooker Robbie Farah says Paul Gallen will remain the leader of NSW's State of Origin quest even if the inspirational captain if ruled out of next week's series decider.

As vice-captain of the Blues, Farah stands to fill in as skipper should Gallen not line up - with the NSW prop racing the clock to make it onto ANZ Stadium on Wednesday night.

A decision on Gallen's availability is expected to made following Friday morning's training run, but even if the worst was to eventuate, Farah said he would only consider himself a fill-in.

"He is our leader, he's the captain of this group," Farah said of Gallen.

"Day in, day out he's going to be around the boys and he's a player that everyone looks up to.

"If I'm needed I'll put my hand up and step into that role, I'll do the job for the night, but I'll only be standing in."

It sets up the possibility of Gallen lifting the Origin shield in his NSW tracksuit, should the Blues overcome his enormous loss and win their first series in seven years.

Farah said it was only second nature to consider the prospect of leading the Blues onto the paddock, but he was confident the scenario would remain in the realm of daydreams.

"Gal's going to be fine unless someone cuts his leg off," Farah said.

"He's a tough competitor, I know how much it means to him to be out there with us and we hope he's going to be out there with us."

While the value of Gallen's leadership could never be underestimated, it could be argued his pure work rate is of greater importance to the Blues.

With the Blues going backwards in game two in Brisbane he was the only NSW forward to run for more than 100 metres, while his 36 tackles were also a team high.

Aaron Woods, who was on debut at Suncorp Stadium and stands to come in for Gallen should he be ruled out, contributed just five runs for 36 metres and 20 tackles in game two.

In the series opener which the Blues won 14-6, Gallen's 188 metres were the most of any forward on the paddock, while his 33 tackles were bettered by only Farah in the NSW pack.

The Blues enjoyed a day off on Wednesday but will return to the training paddock on Thursday.

While Gallen and fellow injury concern Greg Bird (ankle) will be required to run on Friday, a final call on whether they tackle the Maroons may be delayed until Sunday to see how their respective injuries respond to the fitness tests.