The former Crystal Palace, Brentford, and QPR youngster joins Spurs as he looks to forge his own football career.
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His father, Martin, is England’s all-time top try-scorer, having scored over 500 tries during his illustrious rugby league career.
After the move, the young striker wrote on Instagram: "Thank you to everyone who helped me along my journey.
"Happy to say that I have signed for Tottenham. Grind don’t stop now."
His proud da said: "Another proud day in the Offiah household.
"Phoenix signs for Spurs seven months after his older brother Tyler signed for Bath Rugby. The hard work starts now my boy."