"The tournament he played for the Under 21s was really good, so I'm really happy he's now with us. I'm sure he can do a good job at Anfield.
"I've played a lot of games against him for Feyenoord, and also plenty of times in the same team for Holland. I know him very well, and all I can say is I'm really looking forward to playing with him at Liverpool. He's very mature, athletic and fast.
"I believe his whole family is the same and he has a sister who is a top athlete at 100m."