"I am so excited and pleased for everyone," said Kevin Keegan.
"He will be a big asset to this club and I am as thrilled about this signing as any I have made."
"He is a Dutch international who at 33 is excited about playing in the Premiership and in the new stadium.
"He is the type of player who you want in your squad. He is excited about the move. He is not here for a final pay day."
The Dutch midfielder has signed a two-year contract with City.