Allan Saint-Maximin could miss Newcastle's hectic festive programme after suffering a hamstring injury in the dying seconds of the Toon's 2-1 win over Southampton.
And if the problem is as serious as he fears, Magpies' boss Steve Bruce will blame himself for the influential Frenchman's absence.
Saint-Maximin left St James' Park on crutches and said: “It's a bad one.”
Ciaran Clark picked up a calf strain and did not reappear for the second half.
Federico Fernandez scored a late winner after Jonjo Shelvey had cancelled out Danny Ings' 52nd minute opener – his fifth goal in as many games but the 42,303 crowd was Newcastle's lowest since November 2010.
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Bruce had been tempted to rest Saint-Maximin after his exertions at Sheffield United but admitted the forward has been so integral in the Toon's revival, he let his heart rule his head.
“I'm kicking myself because I had toyed with changing us,” he said. “Because I didn't, we've picked up two muscle injuries.
“Saint-Maximin wanted to play but that is the downside of playing someone who is tired.”
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Bruce admitted Newcastle were fortunate to beat the Saints.
He added: “We were nowhere near the levels needed early on. We looked jaded but hung on.
“We tweaked things and Andy Carroll gave us a real lift – he looked like the Andy of ten years ago.”
Saints boss Ralph Hasenhuttel could not believe his side lost a game they controlled.
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“I saw only my team playing football,” he said. “We created the chances but they scored two goals.
“We have no points but can hold our heads high. I am proud of the way my players performed.
“But when you are one up, you must take something out of a game.”
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