The Mirror reports that United chief scout Jim Lawlor watched the youngster in action at the weekend.
United could decide to make a move for the 19-year-old defender before the transfer window closes on Friday.
United face competition from Premier League rivals Everton in the race to sign the defender.
Everton scout Alan Stubbs also watched the youngster in action at the weekend.
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Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.