Redskins linebacker Brian Orakpo Linebacker Brian Orakpo after he was injured in a preseason game against the Chicago Bears in August. (Jonathan Newton/Washington Post)

Linebacker Brian Orakpo said Monday he is certain he will be ready for the Washington Redskins’ regular season opener Sunday at New Orleans.

“To my knowledge, I have no doubts,” Orakpo said. “I should be fine.”

Orakpo missed the Redskins’ final two preseason games after re-injuring his left shoulder and pectoral muscle in the second exhibition game at Chicago.

At the time, Orakpo said he initially believed he’d suffered a serious injury but soon found out otherwise. An MRI exam taken the following day showed no serious damage, and Orakpo and the Redskins said all along they expected him to be ready for the regular season.

Orakpo repeated that after the team’s practice Monday in the indoor facility at Redskins Park, saying he has made good progress since he was injured.

“I’ve been working at it, working at it, getting healthy, rehabbing and stuff,” Orakpo said. “I feel good. Hopefully I’ll be 100 percent come New Orleans. But I’m feeling great right now. I was able to go the whole day today. I was able to go the whole couple days we had on Friday and Saturday. I mean, I’m back.”

The Redskins certainly seem to need Orakpo’s pass-rushing presence against Saints quarterback Drew Brees, who set a single-season NFL record for passing yards last season.

Orakpo led the Redskins with nine sacks last season and has 28-1/2 sacks in his three NFL seasons. He had offseason surgery for a partially torn left pectoral muscle suffered in last season’s finale.