Ravens coach John Harbaugh said that safety Tom Zbikowski has not been cleared for contact yet.
Zbikowski suffered a concussion Oct. 2 against the New York Jets. Because of the concussion symptoms, Zbikowski has been wearing sunglasses while he is out at practice.
With him sidelined, Bernard Pollard has been starting at strong safety.
Wide receiver Lee Evans (ankle) also did not participate in the morning walk-through practice. He hasn't played since Week Two against the Tennessee Titans.