Lardarius Webb's back injury may be more significant than originally thought.
Webb, a starting cornerback for the Baltimore Ravens, sat out his third straight practice. It was first reported that Webb was suffering back spasms and would not miss any extended time.
Coach John Harbaugh indicated that Webb will undergo further testing.
"He's got some back things that we're looking at right now," Harbaugh said Monday night. "Backs are a little weird. At first, it was no big deal. It's lingering a little bit, so we'll find out what's going on with it."
With Webb out, Asa Jackson ran with the starting defense. A fifth-round pick in 2012, Jackson has played in seven NFL games, with no starts.
Already a thin position for the Ravens, this cornerback group has been dinged up early in camp. Aaron Ross suffered a season-ending Achilles injury while trying to pass the conditioning test. Chykie Brown was sidelined one practice with a tweaked hamstring.