Ravens wide recenver Darren Waller (concussion) is out for Sunday's game in San Francisco, Jeff Zrebiec of the Baltimore Sun reports.
Waller got some extra playing time in Week 5 with Steve Smith (back) sidelined, but the 6-6 rookie suffered an injury of his own. Even if he recovers before Smith, Waller is unlikely to be any higher than fourth or fifth in the pecking order for targets.