Papelbon is hoping to start a rehab stint on Monday, William Ladson of MLB.com reports.

EDGE Analysis

Papelbon, sidelined since June 13 with rib soreness, threw a 40-pitch bullpen session Saturday and is hoping to begin a rehab assignment Monday. If all goes well over the weekend and next week with a likely assignment, the 35-year-old could return to the Nationals' bullpen before the All-Star break.