Port Vale have announced the signing of former England U19 defender Aziz Deen-Conteh on a two-and-a-half-year deal.
The 21-year-old ex-Chelsea player made seven appearances for Greek side FC Ergotelis last season.
Vale boss Rob Page told the club website: "I spoke to (Chelsea's U21 manager) Adi Viveash, who worked with him, and he speaks very highly of him.
"We know we've got a talent on board and one we can develop to hopefully benefit the first team and the club."
Deen-Conteh chose to make himself eligible for his country of birth, Sierra Leone, in 2013.