Sims (elbow) will begin the season on the injured list, Bobby Nightengale of The Cincinnati Enquirer reports.
Sims entered camp behind schedule after dealing with elbow and back issues over the winter. There haven't been reports of any setbacks, but he's yet to pitch in a game this spring and won't have time to get up to speed by Opening Day, as manager David Bell confirmed Monday. Art Warren, who posted a 1.29 ERA and a 41.5 percent strikeout rate in 21 innings last season, could open the season as the Reds' closer as a result.