The former Anderlecht youngster has enjoyed his time with West Brom and is determined to build on his impressive year next season.
He said: "I've had a great season and now I want to do better. After last year a lot of people doubted me but I kept believing in my qualities and worked hard.
"With the help of the West Brom fans and this club I just couldn't fail here. From day one I have felt at home, I felt like I was back in Brussels. That's why I have performed so well.
"They have helped me through the good and the bad days. I was really convinced the team would have a good season. It's been wonderful to be here."