The 15 year-old was set to miss the tie due to suspension after receiving a straight red card during Tuesday's 4-3 triumph over West Brom in the U18 Premier League Cup.
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Gabriel was facing a three-match suspension, which would have included the Oxford clash.
However, United lodged an appeal with the FA, which was successful, so overturning the red card and is suspension.
Gabriel is set to start in next week's tie with Oxford, having been the matchwinner in the previous round's win against Wigan Athletic.