"I hope to bring a lot of attacking play and goals. At Ajax I scored quite a lot of goals as an attacking midfielder, sometimes as a striker, and I hope to do that here too," De Jong is quoted as saying by The Mirror. "I want to help the team be as good as it can be.
"I had a great couple of years [as captain] at Ajax and really improved my leadership skills.
"It was good for me to be captain and to have that opportunity at Ajax. I hope that will help me here."
De Jong scored nine goals in all competitions for Ajax last season.