Ryan, 29, has taken batting practice and gone through fielding drills for the first two days of the team's full-squad sessions, but isn't making throws across the infield yet.
"It's not that bad," Ryan said. "We're just doing stuff to make sure, like going on a pitcher's plan, to make sure there are no setbacks or anything like that.
"Part of it is we have so much time that there's no hurry at all," he said. "We're just going to kind of baby-step it along. I'll throw from however many feet, and see how that feels, and then kick it up the next day."
Whether Ryan will be ready to play when the team begins intrasquad games on Feb. 24 or Cactus League action on March 2 remains to be seen, but the ultimate goal is to be 100 percent when the season starts March 28 in Tokyo against the A's.
Ryan declined to put any timetable on his full return, but said he's "not really worried about it."
The shoulder began giving him problems late last season, and he wound up not playing in the final 11 games. He changed his weight-lifting program over the offseason to build up the muscles around the injury, and has been receiving daily treatment since arriving in Peoria.
Ryan and Japanese free agent Munenori Kawasaki have been taking reps with the top group at shortstop during infield drills the first two days of full-squad work. Other shortstops in camp are veteran Luis Rodriguez, and Minor Leaguers Carlos Triunfel and Nick Franklin. Kyle Seager played a few games there last season, but he's currently working in the top group at third base along with Chone Figgins.