United's manager, Gunnar Solksjaer, wanted to sign a CM to make sure the 'Red Devils' were one of the best teams in England this season. The main target was the 'Magpie's' CM, who at 21 years old, has performed really well in the Prem.
He is mostly an attacking player and has been a great help to his team. Man U will try to sign him again, but the summer lasted a long time and they couldn't reach a deal, so nothing will happen until at least January.
That is the objective of the Manchester club, who are overseen by Joel and Avram Glazer, who want to sign the player in the January transfer window, according to the 'Manchester Evening News'.
One of the reasons he never signed was because of the asking price. Longstaff has a market value of just over 11 million pounds, but the Newcastle owners demanded around 28 million due to his young age and future potential.