Sims (elbow) will begin a rehab assignment at Triple-A Louisville this week, Bobby Nightengale of The Cincinnati Enquirer reports.
Sims performed well in his live BP session Friday, and the right-hander will take another step in his recovery process this week. If all goes well in Louisville, manager David Bell is optimistic that Sims could rejoin the Reds as early as next weekend for the team's home series against the Cardinals.