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Longstaff, 21, made a huge impression under Toon boss Rafa Benitez last term, but a knee injury in March ended his season.
Despite United's confidence in bagging the Magpies academy product, Sky Sports News claim there has been no contact between the clubs about a deal.
Reds boss Ole Gunnar Solskjaer is a huge admirer of Longstaff and thinks he will grow and develop into a player who will be in the Old Trafford engine room for years to come.
And despite the uncertainty around a potential sale of the club, United’s top brass are set to launch a formal bid with a bid of around £25million.
Abu Dhabi-based billionaire Sheikh Khaled bin Zayed Al Nahyan is in talks to buy Newcastle and could take the view of keeping Longstaff at the club to keep the St James’ Park faithful on side.
