An article about Roach from NFL.com
Nick Roach released by Raiders; career in jeopardy - NFL.com
A 2013 starter at middle linebacker, Roach missed the entire 2014 season after suffering a concussion in an Aug. 22 preseason game.
He was still struggling with balance and vision when the Raiders placed him on season-ending injured reserve in October.
As of last month, the San Francisco Chronicle suggested that Roach was still experiencing headaches and would not play in 2015.