The Nets have said Cam Thomas’ injured hamstring could be re-evaluated in as soon as three weeks . But a specialist that spoke with The Post said it could be twice that long before the guard is playing again, and cautioned a recurrence is possible.

Thomas was forced out of Wednesday’s game in the first quarter with what was termed left hamstring tightness, and the Nets announced Friday that he had a left hamstring strain that would be evaluated in 3-4 weeks.

“It’s obviously frustrating being hurt with anything — whether it’s an ankle, a foot, whatever the case may be. Nobody wants to be injured,” said Thomas, 24. “But I’m not really concerned about it. I’ll be back in no time, so I’m not really upset or concerned. It’s just unfortunate. But good thing it happened earlier this year, so

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