The Manchester Evening News states that Kingdon signed the contract after impressing the club within the academy.
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He played for the club’s Under-18 side last season, starting in central defense.
Kingdon also wore the armband on two occasions, showcasing his leadership skills.
The teenager also took part in first-team training for the first time in April under coach Erik ten Hag.
He will be hoping to go on United’s preseason tour of the United States this summer.