Mukhtar Ali has completed a permanent transfer from Chelsea to Vitesse Arnhem.
The 19-year-old midfielder, who played for England at both Under 16 and Under 17 level, moves back to the Eredivisie club where he spent the second half of last season on loan.
Ali, who was born in Somalia, came through the Chelsea academy and was part of the team which won the FA Youth Cup and UEFA Youth League in 2015-16.
A statement on Chelsea's official website added: 'We thank Mukhtar for his service and wish him well for the future.