Janmaat has been a key part of Louis Van Gaal's Netherlands side at this summer's World Cup and has been linked with moves to plenty of top clubs around Europe, with a Premier League switch looking likely.
Manchester United are strongly linked because of the Van Gaal factor, with Spurs, Everton, Arsenal, Liverpool and Napoli also tracking the attacking right-back, but Newcastle are now set to rival clubs for his signature.
The Magpies could offer the 24-year-old regular first-team action if he makes the switch to Tyneside as Mathieu Debuchy looks set to join Arsenal after an £8 million fee was agreed between the two clubs.
Debuchy will be a major loss to Alan Pardew's side but if they can act fast to sign Janmaat as soon as the Netherlands World Cup campaign is over, they will have replaced the Frenchman with another quality fullback.
The Feyenoord man featured in all three of the Netherlands group stage victories and will be hoping to get back into the side for tonight's quarter-final clash against Costa Rica.
He made 30 appearances for Feyenoord in the Eredivisie last season and scored twice with five assists to help the side finish second in the league.
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Janmaat outperformed Debuchy in an attacking sense last season and would undoubtedly add a dangerous threat down the right side for Alan Pardew.
It would be an impressive coup were The Magpies able to beat Manchester United amongst others to the 24-year-old's signature but they can offer him regular football, something very few others can match.