Steelers slot receiver Ryan Switzer practiced fully Wednesday, three days after he entered concussion protocol during the loss to the Chargers. Safety Morgan Burnett was also a full practice participant after he missed Sunday’s game because of a back injury. Long snapper Kameron Canaday, who suffered an ankle injury against the Chargers, and fullback Roosevelt Nix, who is listed on the injury report with a shoulder injury are also expected to palky against the Raiders. Among those who did not take practice were outside linebacker Anthony Chickillo and tackle Marcus Gilbert. Gilbert has missed the past six games because of a knee ailment and Chickillo suffered an ankle injury Sunday.