Isago is the son of former Chelsea defender and current Fluminense captain Thiago Silva.
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The 17 year-old joined Chelsea at under-13s level and made his debut for Chelsea Under-18s during the 2024-25 season.
Chelsea state Isago has "developed into a versatile and reliable defender comfortable of operating at both left-back and centre-back".
Younger brother Iago is also part of Chelsea's academy and has been called up to England U15s.