Walston (elbow) isn't expected to return from the 15-day injured list until sometime in August, Theo Mackie of The Arizona Republic reports.

Diamondbacks manager Torey Lovullo said Sunday that he feels good about Montgomery's (knee) chances of returning from the 15-day injured list for the first turn through the rotation coming out of the All-Star break, Alex Weiner of ArizonaSports.com reports.

Kelly (shoulder) threw 32 pitches in a bullpen session Friday, MLB.com reports.

Rodriguez (shoulder) threw 30 pitches in a bullpen session Friday, MLB.com reports.

Jameson (elbow) will throw another bullpen session Friday, Alex Weiner of ArizonaSports.com reports.

Diamondbacks manager Torey Lovullo said Wednesday that Lawlar recently aggravated his strained left hamstring and will be sidelined an additional 6-to-8 weeks, Jesse Friedman of GoPHNX.com reports.

Nelson (shoulder) underwent thoracic outlet surgery Monday, Steve Gilbert of MLB.com reports.