Keenum is in the concussion protocol, Jim Thomas of the St. Louis Post-Dispatch reports.
Keenum's head was slammed to the turf on a late takedown Sunday at Baltimore, but no evaluation was undertaken, and his fumble two plays later led to the Ravens' game-winning field goal. In the aftermath of the game, he was examined for a head injury, which was confirmed as a concussion Monday. If he emerges from the protocol unscathed, head coach Jeff Fisher said that Keenum will be under center this Sunday at Cincinnati. However, the murky nature of such ailments could thrust Nick Foles into a starting role.