Baltimore Ravens rookie defensive end Brent Urban is out for the season with a torn anterior cruciate ligament in his right knee.
Urban was injured in Wednesday's practice, when offensive tackle Jah Reid knocked Urban to the ground in a blocking drill.
A fourth-round draft pick from Virginia, Urban had a torn ACL as a redshirt freshman at Virginia and underwent ankle surgery prior to the NFL Scouting Combine in February.
Coach John Harbaugh said fellow rookie Timmy Jernigan is still experiencing back issues. He missed Thursday's workout after leaving Wednesday's practice.