Peters (back) will throw live batting practice in Tampa sometime this weekend, Chris Halicke of DKPittsburghSports.com reports.
Peters landed on the 15-day IL due to a back muscle spasm in early June, and he won't return to action when first eligible. However, he'll take a significant step in his recovery process by facing live hitters over the weekend and could return to game action sometime next week if he feels good following his live BP.