Feeney arrives from Glentoran, choosing Spurs ahead of Nottingham Forest.
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He became Glentoran's youngest ever goalscorer in their history in October, when he scored as a 15-year-old.
Feeney made 10 appearances for their first team last season.
Spurs have now announced the signing of the 16 year-old, who arrives as part of their U18 intake.