Steve Clevenger (oblique) is expected to begin a minor-league rehab assignment next week. The assignment is expected to last only a week or less. Clevenger could return to the Cubs when they return from a two-series road trip next Monday. The Cubs' catching situation is a mess right now. Geovany Soto was placed on the disabled list Saturday and his backup, Wellington Castillo, is expected to miss a week with a sprained MCL. The Cubs promoted Blake Lalli Friday and dealt for Koyie Hill on Saturday. Hill is expected to get most of the playing time at catcher over the next week. When Clevenger is activated, Lalli will likely be sent back to the minors.