The two clubs are currently far apart in their valuation of the Netherlands right-back, though the Magpies are confident they can secure a discount by paying all money up front
Feyenoord have rejected an opening bid of €6 million from Newcastle United for Netherlands international Daryl Janmaat, Goal understands.
The 24-year-old right-back has been on the Magpies' radar for several months and the impending departure of Mathieu Debuchy to Arsenal has prompted them to step up their interest.
However, the club still hope to broker a deal for less than €10m given their policy of paying fees in full; the Magpies often get reductions in the overall price given how rare it is in football that all fees are paid up front.
Despite their move for Janmaat, Newcastle still have an interest in Manchester City's Micah Richards, who can also play in central defence.
The north-east club, who have already successfully landed Ayoze Perez, Jack Colback and Siem De Jong, hope to have deals for Janmaat and their current top transfer target Remy Cabella sealed within the next week.
Newcastle recently lodged a bid worth around €12m for the Montpellier and France midfielder, having failed to sign him in January and prior to the World Cup.