The 21-year-old is out of contract at United this summer, and will be released.
As Taylor cannot count on a new deal at United, he is looking for another club.
According to The News, he is with Pompey and was involved in their reserves winning 2-1 against Luton in midweek.
It is unclear if Taylor will be offered a contract by Portsmouth.
Taylor has gone through a lot in his short life, recovering from testicular cancer a few years ago.
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