The attacker midfielder has been linked with a switch to Stamford Bridge recently.
However, he has put pen-to-paper on his first professional deal with the Cottagers until the summer of 2025, as announced by their official club website.
The Blues will now have to look elsewhere now for talent to bolster their youth ranks.
Harris is highly-rated by Fulham and has been a key player for them at various youth levels over recent years.
The 17-year-old has been on the bench for a handful of their Premier League clashes so far this term and made his senior debut in their Carabao Cup defeat to Crawley Town last month.
He is delighted to have signed a contract and has told the club website:
“I’m really pleased to extend my time here at Fulham having been here from a young age.
“I couldn’t have done it without my parents who sacrificed a lot for me, driving me away on the weekends as a young kid, so they deserve a lot of credit. I’m enjoying my football and I’m very excited for what lies ahead.
“The Club means a lot to me and my family. I’m grateful to Fulham as they’ve given me opportunities and helped me progress from the Academy right through to the First Team.”
Harris scored 13 goals across 18 appearances for Fulham’s U23s last season and is a name to keep an eye on.
Marco Silva’s side are back in action this evening away at Nottingham Forest, who were promoted with them from the Championship in the last campaign.