Everton have announced that David Henen is returning to the club on a three-year permanent deal after spending last season on loan at Goodison Park.
The 19-year-old Belgian was a regular for the Under-21 side during last season, scoring six goals during his year-long loan from Olympiacos.
The winger told the club's website: "I am so happy. Everton are a big club and I feel I can develop here. For a young player it is the best club because they try to develop youngsters. It is perfect for me."
Henen has previously had spells with Monaco and Anderlecht.