Facyson sustained a concussion during Saturday's wild-card contest at Cincinnati.
The diagnosis isn't a surprise after Facyson took a hit to the helmet from teammate Cory Littleton early in the third quarter. Facyson remained on the turf for a spell before he was able to jog off the field under his own power. Having said that, a visit to the sideline tent was enough for the Raiders to rule him out. Desmond Trufant took over for Facyson at outside cornerback for the rest of Saturday's game.