The 15 year-old winger has trained with the first team this season under former manager Ruben Amorim, but this is the first time Carrick has decided to take a closer look.
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Premier League rules will prevent Gabriel to make his debut this season.
Gabriel does not turn 16 until October and won't be eligible to sign pro terms until he turns 17.
Still on scholarship forms, Gabriel's progress is being tracked closely by Barcelona.