(Photo credit: Jayne Kamin-Oncea-Imagn Images)Chargers running back Najee Harris sustained an Achilles injury on Sunday is expected to be out for the rest of the season. First-round pick Omarion Hampton will step into the starting role, but head coach Jim Harbaugh plans to add depth at the position. Harris went down in the second quarter of the Week 3 win against Denver with a non-contact injury to his left leg. In five career seasons with the Pittsburgh Steelers (2021-24) and Chargers, he has 4,373 yards on 1,112 carries with 28 touchdowns. Harris was a Pro Bowl selection in his rookie season of 2021 after he was a first-round draft pick by the Steelers out of Alabama.