It's another tough hit for the ultra-physical, super-tough Gillmore, who has been plagued by injuries over his first four years.

The 2014 third-round pick out of Colorado State played in just seven games last year because of back and hamstring injuries. He's also dealt with calf, groin and shoulder injuries that have limited him to just 32 games in three seasons.

The Ravens got better news on cornerback Maurice Canady, but it's still not good. Canady also had a knee injury, though it's to the outside of the ligament, Harbaugh said. Canady could be a candidate to return off injured reserve at one point (the team can bring back two players per new league rules).

"It's not five months," Harbaugh said. "He could come back at some point in time."

Canady shined during the team's offseason camps and picked up where he left off with an interception on the first day of training camp. It seemed he was penciled in as the team's starting nickel cornerback after Young's injury.