Sims (elbow) completed a side session Wednesday and plans to throw against hitters before the end of camp, Bobby Nightengale of The Cincinnati Enquirer reports.
The Reds have already confirmed the right-hander will begin the season on the injured list after dealing with elbow and back injuries over the winter, though the hope is he'll only spent the 10-day minimum on the shelf. Sims was expected to open the campaign as the favorite for save opportunities, but Art Warren, Luis Cessa and Hunter Strickland are all in the mix to close in the meantime for Cincinnati.