Pittsburgh Pirates outfielder Josh Harrison will begin a rehab assignment at Triple-A Indianapolis while recovering from a thumb injury, according to the Pittsburgh Post-Gazette. Harrison underwent surgery to repair a torn ligament in early July, and though he said he may not be 100 percent healthy, he believes he can play well enough to help the team down the stretch. "It's typically the top hand (that stings),” Harrison told the Pittsburgh Tribune. “I've got a grip on my bat for any protection I may need. I understand over the course of playing there may be a few balls I hit or field that may aggravate (the thumb) a little bit, but I think I'm past the point of being too cautious. I've gotten to the point where I'm comfortable.” Harrison is hitting .279 with four home runs and nine stolen bases in 75 games.