The Pilgrims have signed highly-rated Corby Town right-back Kalern Thomas (22) and versatile defender-come-midfielder Herve Pepe-Ngoma (20).
Pepe-Ngoma, born in Germany, started his career at Leicester City before playing for the likes of Corby and Kettering Town.
Both players will link up with their new team-mates for pre-season training on Saturday June 25.