The Baltimore Ravens have placed Breshad Perriman on injured reserve.
Perriman, the No. 26 overall pick, sprained his posterior cruciate ligament on the first day of training camp, aggravated the injury before the Sept. 27 game against the Bengals, and underwent arthroscopic surgery in early October.
"He's had probably one of the all-time slowest-healing sprained PCLs ever," Harbaugh said in early October. "That's nothing against him. It's just the way it is."