The midfielder knows that he is a first-choice player for his club and a key player for his country.
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Despite only being 19, The Mail states that Mainoo is demanding a huge wage rise.
He currently earns around a tenth of what he is demanding, which could lead to an issue.
The source adds that if United cannot agree on a new deal, they may sell him this winter or next summer.
Many United supporters will be dismayed at the news, given the club’s rich history of nurturing academy talent.