Gallen (elbow) was given permission to begin throwing and has thrown twice this week, MLB.com reports.
Gallen received a second opinion this week from Dr. Neal ElAttrache, who granted the right-hander permission to begin throwing again. Diamondbacks manager Torey Lovullo told Douglas Santo of Arizona Sports that Gallen has thrown out to 75 feet. Gallen will undergo another MRI in early August, at which point the club will determine how aggressive they can push his rehab.