All three will be allowed to come off contract at United over the summer, says the Manchester Evening News.
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Defender Kingdon (above) is currently playing on-loan with Rochdale and has helped them into the National League playoffs.
Left-back Murray, 20, signed from Huddersfield as a teen, and has been a regular with the U21s this season.
Nolan, who like Kingdon is a Scotland youth international, has spent the season at home with Inverness Caley on-loan.
