Eduardo Nunez (rib cage) took batting practice Wednesday.
Kevin Youkilis (back) took six at-bats in a simulated game Wednesday.
Jorge De La Rosa improved to 6-3 after limiting the Diamondbacks to one run in 5 1/3 innings Wednesday.
Andy Pettitte (trapezius) will play catch either Thursday or Friday.
With Rafael Betancourt sidelined, Rex Brothers earned his first save of the year by pitching a scoreless ninth inning Wednesday against the Diamondbacks.
Martin Prado went 0-for-4 on Wednesday and has fallen into a 2-for-19 slump.
There is no timetable for when Ivan Nova (triceps) will be activated from the disabled list.
Sean Marshall was not available out of the Reds' bullpen on Wednesday due to a "cranky" left shoulder.