Steve Bruce says he is deeply concerned about Miguel Almiron's half-time withdrawal in the 1-1 draw with Wolverhampton Wanderers.
The Paraguay international hobbled off at the break and was immediately assessed as the game was being played out.
After stretching for a loose ball, Almiron looked to have picked up a knee injury and Bruce stated he was in "distress" at the interval.
Bruce said last night: "It's too early but for him to come off and be in the state he is in we fear the worst.
"He was in distress at half-time.
"He will have scans on Sunday to see how he is."
Bruce also lost Emil Krafth and Allan Saint-Maximin with muscle injuries.
He said: "The injuries have disrupted us but we've had enough big chances to get a couple of goals but unfortunately we didn't take them."
When asked his thoughts after banking just a point, Bruce said "A point is a point.
"It could be enough.
"We'll have to wait and see.
"The players are frustrated because they played very well but unfortunately gave away a bad goal."
Joelinton missed one of 19 chances created by Newcastle, Bruce said: "It’s the same story, if you create chances but don’t take them, in the Premier League you’ll get punished.
"We’ve had three wonderful chances and then one with Joelinton with 10 minutes to go."
