Axford (shoulder) threw a bullpen session Tuesday and is slated to throw another Thursday, Susan Slusser of the San Francisco Chronicle reports.
Axford said that he's feeling strong and suggested that, at this point, it's just a matter of fine-tuning his mechanics. The 34-year-old has been quite durable throughout his major-league career, making 60-plus appearances in each of the past six seasons, but Axford hit the DL with a strained shoulder during the first week of this season and there is no firm timetable for his return.