Both players joined the Club in July 2019 on initial short-term loans from Southend United, but they have become mainstays in the Hawks' squad.
Terrell has made 22 appearances so far this season, scoring 6 goals, while Miles Mitchell-Nelson has featured 23 times for the Hawks.
We can also confirm that we have released Kevin Dalipi, Oliver Finch, Anders Eriksson, Samson Doherty and Desmond Jibona, who all find themselves outside of the plans of Manager Danny Chapman.
We would like to wish all departing players the best for the future, and thank them for their contributions this season.
The Hawks are next in action on Saturday 11th January when they travel to Chertsey Town. Kick off is at 3pm.