"I know the Club has a great stadium with great fans. I want to play here as soon as possible - I want to feel the atmosphere and hear the crowd. I cannot wait to get started."
It was previously thought the Magpies had agreed a deal with the Dutch giants of around £14million.
Wijnaldum, 24, had previously been linked with a move to Manchester United, Arsenal and Liverpool but the Tyneside club moved quickly to secure one of their top targets.
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