Oakland rookie cornerback D.J. Hayden suffered a minor hamstring injury. He was not going to play in Friday’s preseason opener against Dallas, anyway. He has yet to be cleared for contact because of his recovery from a life-threatening heart surgery last November. Oakland coach Dennis Allen has said Hayden, the No. 12 overall pick in the April draft, will play in the preseason.

• San Diego safety Brandon Taylor took another step in his recovery from a torn ACL. He was practicing in team drills Monday. He was working in individual drills last week.

• Oakland guards Mike Brisiel and Lucas Nix returned to practice. Nix was working some with the first team Monday. He is fighting 2012 third-round pick Tony Bergstrom for the starting job.

• The Chargers signed linebacker Jerrell Harris. He was on three different practice squads last season, including in Oakland. He is an Alabama product. He’s a longshot to make the roster.