The Washington Post reported Sunday that an MRI exam taken on Orakpo's left shoulder area showed "nothing serious at all," according to Ben Dogra, the linebacker's agent.
"He will be ready for the opener," he said.
Orakpo was injured in Saturday night's 33-31 loss to the Chicago Bears when he attempted to make a tackle of wide receiver Devin Hester. He grabbed at his left arm as he fell to the ground, sparking concern he reinjured the pectoral muscle.
Though the MRI result is obviously good news for the Redskins, the linebacker's health will remain a huge concern. Pectoral injuries are unforgiving, and losing Orakpo for any period of time would be a crushing blow for Washington's defense.
Follow Dan Hanzus on Twitter @danhanzus.