The Ravens wanted to acquire expertise on special teams and for him to provide depth on defense with safety Emanuel Cook out for the season with a broken right leg and safety Sean Considine recovering from a pair of concussions.
"Being in the league for six years now, I bring that leadership mentality of the big game, of playing in multiple AFC championship games and the Super Bowl, and also being an expert on special teams and whatever I can bring to the defense," Ihedigbo said. "I told coach [John] Harbaugh, 'Whatever you need me to do, coach.'"
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Ihedigbo was signed to a one-year, $700,000 contract that included no signing bonus and counts for $540,000 against the salary cap under the minimum salary player benefit.
"It was real quick," Ihedigbo said. "Once we got everything situated, I was here the next day."
Ihedigbo, 28, started a dozen games for the Patriots last season, finishing with 69 tackles and one pass deflection. Heading into his sixth NFL season, the 6-foot-1, 214 pounder has 118 tackles and five sacks.
It didn't take much convincing for the Ravens to strike a deal with Ihedigbo considering his mother lives in Abingdon and the team won the AFC North title last season.
"I have a lot of respect for their organization for many years now," Ihedigbo said. "I feel honored and privileged to be a Baltimore Raven."