Twenty Ravens players missing from Friday's practice

OWINGS MILLS, Md. — The Ravens were missing 20 players from their 90-man preseason roster as they practiced in shells and shorts on Friday afternoon.
A handful of veterans appeared to be awarded the day off as head coach John Harbaugh periodically does, but several notable players continue to nurse injuries.
Wide receivers Breshad Perriman (knee) and Marlon Brown (back) remain sidelined as the Ravens offense has worked without two of its top four wideouts for most of training camp. The first-round pick Perriman has missed seven straight practices after injuring his knee in the final 20 minutes of the first full-squad practice of the summer while Brown has now sat out five of the last six workouts.
Tight end Maxx Williams was also absent on Friday after being poked in the eye and leaving Thursday’s workout early.
Baltimore continues to deal with injury problems at the guard position with starter Kelechi Osemele (foot) and backups John Urschel (head) and Robert Myers (head) all out. Urschel and Myers both left Thursday’s practice with concussions, according to Harbaugh.
On the defensive side of the ball, defensive linemen DeAngelo Tyson and Brent Urban were new absences due to unspecified reasons. Cornerbacks Tray Walker and Chris Greenwood remain out with hamstring strains.
Outside linebacker Zach Thompson (undisclosed) was also missing again.
The list of veterans believed to be receiving a day off on Friday included wide receiver Steve Smith, running back Justin Forsett, cornerback Lardarius Webb, linebackers Daryl Smith and Terrell Suggs, and defensive end Chris Canty.
Tight end Dennis Pitta (hip) and safety Terrence Brooks (knee) remain on the active physically unable to perform list.
Already out for the season with a biceps tear, safety Matt Elam rounded out the collection of 20 players not participating in Friday’s workout.