According to reports in Holland, Newcastle, who are third in the Barclays Premier League win following Saturday's 2-1 victory over Everton, have watched the 21-year-old FC Twente striker on a number of occasions this season.
In demand: Newcastle and Liverpool are interested in De Jong (right)
De Jong is regarded as one of the hottest prospects in the Erdevisie and has also attracted interest from Liverpool.
Toon owner Mike Ashley is keen to avoid last summer's disappointing transfer window in which they failed to land a long-term replacement for Andy Carroll who left for Liverpool in a ?35m deal in January.
The future's bright: De Jong is viewed as one of the hottest prospects in Holland
And De Jong, who has recently broken into the Dutch national side, has been earmarked among the club's top targets when the window re-opens.
De Jong has scored nine goals in 15 appearances for FC Twente this season, and broke his international duck after finding the back of the net in Holland's 2-0 win over Finland in September.
Newcastle 2 Everton 1: Party Tyne as unbeaten Toon continue spectacular startInjury could force Newcastle striker Best to withdraw from Ireland squad