The left-handed reliever, who has been dealing with a strained right hamstring, spent the weekend in Boston receiving acupuncture treatments.
"He's here, and he seems in good spirits," said Red Sox manager Terry Francona. "He will start the throwing program today. That's like the 60-90 feet [progression]. Depending on how he feels will determine how quickly he ramps up. I think he's in pretty good spirits, which means, normally, he feels pretty good."
In Okajima's absence, Felix Doubront has been filling the role of Boston's primary lefty reliever. Dustin Richardson is Francona's other lefty.