"We hope that this move will allow Lee to start playing regular football," said technical director Peter Bosz on Feyenoord's official website. "We have a plan for how we want Feyenoord to play next season and there is no place for Lee in that."
However, Bosz believes that Lee could still make a return to the side if he impresses in the K-League next term.
He added: "We hope that Lee will play well. We will try to follow him closely this year."