The 15 year-old prospect saw Arsenal's 4-1 North London derby rout of Spurs.
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Gabriel, however, was not there in a secret trip, with the teen posting to social media of his visit as he sat alongside his father.
He was there as a guest for Nike, which have the winger on a boot deal.
Gabriel cannot sign pro terms with United until he turns 17. He does not turn 16 until October.
Interestingly, Gabriel's father, Joe O’Cearuill, is a former Arsenal youth teamer.