The Red Devils have a total agreement with the teenager, according to Academy Swoop.
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The outlet states that Obi-Martin has already completed his medical for the Red Devils.
He will become their third summer signing and will only cost a modest compensation fee.
Obi-Martin had a great offer from Arsenal and clubs in Germany, but chose the Red Devils.
He is said to have been given a bumper pay rise, but also promised first team minutes.