The Magpies are said to be in talks with Irish youngster Alex Murphy, per Chronicle Live.
The 19-year-old, who arrived from Galway two years ago, has featured twice for the first team this term.
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Murphy's current deal expires in 2025, but Newcastle want to reward him for good progress.
The Republic of Ireland Under-19 international can play at centre half or left-back.
He is said to have recently switched agency and is now represented by Wasserman.