Alex Mighten and Hwang Ui-jo have returned from their respective loan spells at KV Kortrijk and Norwich City.
Mighten scored three goals in three Premier League 2 appearances for Forest's B Team at the start of the season before joining Kortijk on loan in September.
The forward went on to make 12 appearances in all competitions for the Belgian side, starting four times.
Hwang joined Norwich in September, going on to make 18 appearances for the Canaries, scoring three goals.