The former Charlton Athletic prospect inked terms this week after rapid progress over the past 12 months.
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Ezenwata, 17, is now a regular with Chelsea's U18s and has also made his U21 debut this season.
The striker has also played for England at U18 level and for the nation this year in the U17 World Cup.
Along with his U21 debut, Ezenwata also tasted UEFA Youth League action against Atalanta.