Three Ravens defensive starters weren't practicing today.
Ngata injured his left knee during a 20-17 overtime win over the Cincinnati Bengals last Sunday, but he returned and finished the game. Smith has a lingering hamstring and lower back injury.
Webb has a groin injury.
Strong safety James Ihedigbo (toe) and cornerback Jimmy Smith (groin) were limited.
Backup running back Bernard Pierce (toe, knee) participated fully as well as wide receiver Brandon Stokley (groin).
The Chicago Bears ruled out quarterback Jay Cutler with a high-ankle sprain and linebacker Lance Brings due to a shoulder injury.
Defensive tackle Jay Ratliff (groin), defensive end Shea McClellin (hamstring) and long snapper Patrick Mannelly (calf) didn't practice.
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