Midfielder Grant Roberts (27) has sealed a return to The Jakemans Stadium following a near two-year injury lay-off with a knee injury, having played in two play-off campaigns with the Pilgrims in 2015 and 2016.
Striker Andre Johnson (22), meanwhile, has linked up with United after spending last season with National League North rivals Alfreton Town. He scored in the Pilgrims' opening pre-season friendlies against Basford United and Tadcaster Albion.