"We are sure he will succeed at Liverpool. Every time he has moved up a level people expect him to fail, but he never does," said club spokesman Zido Gader.
"He didn't when he moved to us from Utrecht and he didn't when he started playing for the national side. And he will not fail in Liverpool."
"He is an icon here at Feyenoord, the biggest player, the most popular player with the fans, he was the image of the club.
"Since Dirk arrived here three years ago he has always been the icon of the club, the best runner, best worker and good in front of the goal.
"He's always working for the team and a great captain of the side. He is the most popular player and Liverpool are getting a great deal and we are sorry to see him go."