Borucki (forearm) has been throwing off a mound and is expected to progress to side sessions this week, Shi Davidi of Sportsnet.ca reports.
The left-hander has been on the shelf with a forearm strain since May 14, but he's progressed quickly since recently starting up his throwing program. Borucki could begin a rehab assignment if he continues to avoid any setbacks after advancing to side sessions.