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
Newcastle United have had an opening bid of £4.7 million for Netherlands international Daryl Janmaat rejected by Feyenoord, 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 £8m 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.
Feyenoord are standing firm in their negotiations with Premier League clubs so far this summer, and are holding out for £8m for Southampton target Graziano Pelle.
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.
The Magpies recently lodged a bid worth around £9.5m for the Montpellier and France midfielder, having failed to sign him in January and prior to the World Cup.