The winger is one who the club rate very highly and were hoping to give minutes.
However, The Mail states that Shea is injured and will have to sit out the remainder of the campaign.
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He posted as much on social media, telling fans: Gutted to have picked up another injury to finish my season early looking forward to next season."
The Red Devils had five academy players on the bench against Sheffield United last week.
Harry Amass, Louis Jackson and Habeeb Ogunneye are those on the periphery at present.