The 22-year-old signed the deal on Tuesday, according to Feyenoord’s official website.
“His technical skills are outstanding and he knows how to find the net,” Feyenoord coach Mario Been told the official Feyenoord website.
“Additionally, he has a superb left foot and we don’t have too many left footed players in our squad. Stefan really wanted to join us and I’m glad that we succeeded in signing him.”