The young Belgian moved from Anderlecht last year.
"It was tough but, when you are coming to Manchester United, it is one of the biggest clubs in the world so you come here with the ambition to try and get in the first team of Manchester United. It's a much bigger thing," he told manutd.com.
"It's a big decision but you know you always have to keep working. Even if you make a big step, the work carries on until it pays off and you will do something in your career. I have to keep working and do my best."