The 23-year-old has signed a five-year contract with the Magpies.
The highly-rated midfielder will be included in the Newcastle squad for the clash with Tottenham this weekend.
Anita made his debut for Ajax in 2005.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?