Already shorthanded in the backfield and planning to lighten top running back D'Andre Swift's workload, the Detroit Lions added depth at the position Monday, signing Justin Jackson.
Jackson ran for 1,040 yards the past four seasons, making seven starts and appearing in 43 games with the Los Angeles Chargers. He played primarily as a backup to Austin Ekeler with the Chargers last season and was a part-time contributor on special teams.
The Lions have seven running backs on their training camp roster, but fullback Jason Cabinda is on the physically unable to perform list because of an ankle injury and undrafted rookie Greg Bell has not practiced since suffering hip and back injuries last week.