Per Yahoo:
Chase Blackburn has always been a valuable special teams force and insurance at all three linebacker positions; however, last year shoulder and knee injuries took their toll on him, and with the addition of rookies Greg Jones and Jacquian Williams, Blackburn's return looks doubtful.
Domenik Hixon has been cleared to practice, but the team has been managing his workload early in camp to avoid any setbacks.
Reggie Corner made his practice debut after being activated off the physically-unable-to-perform list. He opened camp on the list while recuperating from an undisclosed injury.