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.
What is your opinion? Feel free to discuss the article under. You have to comment by using your Facebook profile. Be fair and have respect for other people and opinions!
Who of Europe’s top strikers will move to England this summer?
After a dreadful start to their Bundesliga campaign, Borussia Dortmund appear to have weathered the storm after going five matches without defeat.