Harrison had been on-loan with Shrewsbury for the first-half of the season.
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The teenage goalkeeper represented England’s U20s during his loan at Shrewsbury and is now back with United.
Harrison had a formative stay with Chester in the National League North last term and, after coming back to United midway through the campaign, featured in a Premier League matchday squad during the second half of the season.
The youngster's deal runs to the end of this season.