The defender pens terms after turning 17 years of age.
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England youth international Diakite has been a regular with Chelsea U18s this season and also broke into the U21 team.
He also tasted UEFA Youth League action this term with the Blues.
On his debut for England U17s in September 2025, he scored the winning goal against Israel, before captaining the side against the Faroe Islands during last month’s international break.