The Portugese hitman was replaced by Mark Yeates after only 14 minutes of the 3-3 draw at Stevenage Borough.
Chris pointed out afterwards: "Helder was a bit stiff on Monday at the very top of his hamstring but he was fine. He trained before the game and he was fine in the warm up.
"The good news is that it was stiffness again, he made us aware of it and we took him off early.
"We'll have to wait and see how he is in the morning."
Chris Hughton has explained that Helder Postiga was withdrawn early from last night's reserve clash against Watford as a precaution.