Ngata was pushing into the backfield on a Giovani Bernard run when he went to the ground with a non-contract injury. He was able to walk off the field with the assistance of trainers, but was in noticeable pain.
The Ravens will turn to Terrence Cody in Ngata's absence. He's a capable short-term option, but the fourth-year defensive tackle doesn't have Ngata's veteran prescence in the huddle, and traditionally struggles with quicker running backs. Cody is having problems with Giovani Bernard on Sunday, and has not been able to hold the point of attack when asked.
If Ngata is forced to miss significant time it would be a huge blow to a defense still learning to compete without Ray Lewis and Ed Reed. Both veterans left the team following their 2012 Super Bowl win as Lewis retired and Reed signed with the Houston Texans.