The Chargers signed Johnson to the practice squad Monday.
The Chargers waived Johnson on Sunday. The running back cleared waivers and was promptly invited back to the team's practice squad. Johnson played in all three preseason games, rushing 15 times for 53 net yards and two touchdowns while adding two receptions for 68 yards. Johnson may have a shot at some regular-season playing time if Keaton Mitchell (undisclosed) misses time.