LOS ANGELES -- Rams cornerback Marcus Peters suffered a calf injury in the first half against the Chargers and will not return to the game, a source told ESPN's Adam Schefter.
Peters was helped off the field by trainers and taken to the locker room on a cart.
Peters, 25, was injured on a 27-yard pass from Chargers quarterback Philip Rivers to tight end Antonio Gates.
The Rams acquired Peters, who leads the NFL with 20 interceptions dating to 2015, in an offseason trade with the Kansas City Chiefs.