The Magpies have reportedly agreed a fee with the Dutch side for the 23-year-old, who they want as a replacemet for Jose Enrique who joined Liverpool earlier this summer.
Pieters told Algemeen Dagblad newspaper: “If a club from the Premier League says they want you, and that is the case, then you know the financial means they have.
“Whether I play for PSV at Excelsior on Sunday or am already at Newcastle I do not know.
“I have not seen much of Newcastle myself but my friend (and fellow Dutchman) Tim Krul keeps me informed.”
