The 22-year-old midfielder is set to undergo a medical and discuss personal terms ahead of his proposed £6.6 million transfer from the Dutch champions and is expected to sign a five-year deal at St James' Park.
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"I've played with him since the Under-15 squads," Krul told NUsport.
"I think he's ready for a move to the Premier League. His skill on the midfield and duelling is good enough for England.
"I understood he has to reach an agreement himself, but I think we can use a versatile player like him very well."
The Netherlands international, who can also play at left-back, will follow the arrivals of Romain Amalfitano, Curtis Good and Gael Bigirimana as the Magpies look to match their achievements of last season where they finished fifth in the league.