Mitchell Pearce failed to finish the game on Friday after suffering a heavy cork to the leg.
According to nib Newcastle Knights coach Nathan Brown, the skipper wanted to push on but was unable to.
"He's got a real nasty cork," Brown said.
"How he's going to be for next week's games, I couldn't honestly tell you.
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"They were pretty confident Mitch was going to be able to run but Mitch wanted to have a shot at it and it didn't work out so well."
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When probed further if Pearce is in any doubt for next week, Brown said; "I couldn't honestly tell you but the fact it was a nasty one and we've got a plane flight, that doesn't help.
"I wouldn't say he's 100 percent certain. I suppose we'll know a little more in the next few days.
"Hopefully we can get him on the park."
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Connor Watson missed Friday's loss to the Wests Tigers and is unlucky to be fit to take on the Warriors in New Zealand next week.
That means Brown could be forced to look at a positional switch or bringing someone up from ISP NSW to fill the void if Pearce is also unavailable.
"I don't think Connor will be fit so if Mitch is not playing, we'll certainly be looking for something there."
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Injured players and expected return dates:
Tautau Moga (ACL, Season)
Slade Griffin (Knee, Season)
Jacob Saifiti (Shoulder, Indefinite)
Nathan Ross (Groin, Indefinite)
Connor Watson (Groin, Indefinite)
Mitchell Pearce (Corked leg, Indefinite)
Jacob Lillyman (Abdominal, Round 22)