NSW have reportedly been dealt an injury blow to Mitchell Moses.
The five-eighth pulled up in training on Monday with a suspected tightness in his hamstring, according to Code Sports.
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He completed training before undergoing extra drills until he felt a problem with his leg.
Moses will undergo scans tomorrow and faces a race to be fit in time for Origin 1.
Blues have made contingency plans by calling up Bulldogs star Matt Burton, who
impressed as the Dogs ended their losing streak on Friday by beating Melbourne Storm 30-20.
While Ethan Strange is set to start if Moses is unavailable in what will be his Blues debut.
But losing Moses would be a significant blow for the Blues and coach Laurie Daley.
The Parramatta star boasts plenty of Origin experience, having made his debut in 2021.
He produced two assists in his first game as Blues fell to defeat, though he had to wait two years for his next game and only got his chance due to a Nathan Cleary injury.
He tasted victory on that occasion to prevent Queensland completing a clean sweep in the 2023 series.
An injury also forced Moses out of game two last year, though Blues appear to be confident his replacement Burton will be up for the challenge.
Canterbury captain and NSW centre Stephen Crichton said: “For him [Burton] to put that out there on the field, he’ll get a lot of confidence out of that.
“When he plays like that, Bronson Xerri plays the way he did, and it has that ripple effect.”