The Chargers announced Wednesday that they have signed S Paul Oliver to a one-year contract and placed LB Jonas Mouton on injured reserve.
Oliver, who played in 44 games with the Chargers from 2007-10, signed with the Saints after the lockout before being released following training camp. He has three career interceptions and 11 career starts.
Mouton, a 2011 second-round pick by the team, injured his shoulder in the Chargers' preseason finale against the 49ers. He had been inactive for the first two regular-season games.