The report, though, has also claimed that Newcastle have stated that they will not sell the 21-year-old midfielder.
The publication has reported that United scouted Longstaff between December and March 2019, and that Liverpool and Manchester City also sent scouts to take a look at the youngster before he picked up a knee injury.
Longstaff is a very good central defender, and there is no surprise that Liverpool, City and United all are reported to be interested in the 21-year-old.
It will be wise of Newcastle to keep hold of Longstaff, who is one for the future.
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