NSW coach Brad Fittler admits Wade Graham's hamstring woes have become a concern for the Blues a month out from the State of Origin series opener.
Graham conceded he was unsure if he'd be fit for the June 6 clash, after he lasted just 27 minutes in his return match during the Sharks' nail-biting 22-20 win over Parramatta on Saturday.
The NSW back-rower spent much of the game on the sideline with an ice pack on his left hamstring.
Sharks coach Shane Flanagan on Sunday told Triple M that Graham was facing two to three weeks on the sidelines.
If he misses the Sharks' next three games, Graham will not play before Origin I, opening the door for the likes of Tariq Sims and Jack de Belin to make their debuts.
"Hamstring injuries become a real confidence issue," Fittler told Channel Nine's Sunday Footy Show.
"You not only have to battle to deal with the actual injury itself. There becomes a confidence with being able to stretch out and being able to kick the ball.
"His left-foot kick is so valuable at the moment. He needs to not only have the confidence to be able to do it but to get out on the field and give everything 100 per cent."
Graham first injured his hamstring in the Sharks' round-six loss to St George Illawarra, and has since missed wins over Cronulla and the Gold Coast.
And while Graham desperately wants to represent his state again, the difficult nature of hamstring injuries is clouding his chances.
"I just have to get through a game for Cronulla first," Graham said when asked if he'll be fit for Origin I.
"Origin's probably not even on the radar for me at the moment now.
"If I can't get through 80 here, that's got to be the first focus."
While the injury-hit Sharks want Graham back they'll take no risks amid a spate of injuries to their senior players.
Skipper Paul Gallen is a chance to take on Canberra next Sunday however Luke Lewis will be out for several more weeks with a calf strain.
Jayson Bukuya will also return after this week being hospitalised with a virus, though Scott Sorensen suffered a suspected broken hand.