The Magpies are said to have submitted a formal offer in the region of £3.15 million for the Brazilian-born defender, who is close to securing Dutch citizenship.
Boss Alan Pardew is desperate to bolster his back four this summer but will have to beat off interest from Premier League rivals Fulham and West Ham United who are also rumoured to be tracking the 24-year-old.
However, Douglas revealed that he is unaware of any offer from the Tyneside club stating that he wants to remain at the De Grolsch Veste leaving Munsterman unsure as to what his future plans are.
“It is unclear what Newcastle United and Douglas want exactly,” he told De Telegraaf.
“Douglas says he wants to leave one week and the next week he wants to stay.”
Newcastle are keen to move the deal forward and a source close to the player told the Evening Chronicle that discussions over a transfer have taken place.
“Newcastle is a very good club and I am sure it could be a very good step up for Douglas,” they said.
“But there has been no contact for the player yet. A transfer has been discussed by the club though and his representatives will be flying over from Brazil to talk soon.”