Derek Holland (shoulder) threw a 30-pitch bullpen session Sunday, Anthony Andro of FOX Sports Southwest reports.

Holland (shoulder) threw a 30-pitch bullpen session Sunday, Anthony Andro of FOX Sports Southwest reports.

Analysis:

Holland will throw again Tuesday and Thursday, hoping to eventually work his way up to a rehab assignment. He still needs to build up arm strength, and the assignment will likely be a lengthy one. Holland hopes to join the rotation in August, but he probably won't be ready any sooner than the middle of the month.