The npower League One club announced that defenders Tom Williams and Carl Regan would not have their short-term deals renewed.
But Jordan Stewart and Damion Stewart are considering offers to remain at Meadow Lane.
Meanwhile, on-loan striker Chris Iwelumo, who has made five appearances for the Magpies, will return to Watford.
- Sports & Recreation
- Damion Stewart
- Jordan Stewart
- Carl Regan