There were a couple of injury concerns as the Ravens ended their final special teams practice of training camp.Backup tight end Ed Dickson walked off the field with a trainer. His injury status is unknown.Also, wide receiver Mark Clayton didn't practice. He watched as the other returners -- Tom Zbikowski and Donte' Stallworth -- fielded punts.Ravens cornerback Lardarius Webb, who is on the physically-unable-to-perform list, continues to look strong in his recovery from knee surgery. He was running sideline-to-sideline at a full sprint.For the latest Ravens news, follow Jamison Hensley on Twitter. Also, become a fan of Baltimore Sun Sports on Facebook.To receive breaking Ravens news delivered to your mobile device, text FOOTBALL to 70701 or sign up here.