Tetsuto Yamada (left side, rib) could be ready to rejoin the active roster as early as August 24 (Chunichi at Jingu), although August 26 (Hanshin at Koshien) seems more likely. The Yakult Swallows will determine the schedule after observing him during workouts today.
[UPDATE @ 9:45pm]
Yamada is slated to join the Ichi-gun team for work outs on August 24. Assuming no issues, he could be added to the active roster in time for the Chunichi game in the evening.
Source: Tokyo Sports 8/23/2016