Grimm (finger) is set to begin a rehab assignment with Triple-A Iowa on Sunday, Jesse Rogers of ESPN.com reports.

EDGE Analysis

Grimm has been throwing off a mound for a few days now, and since he's experienced no issues with gripping the ball following a bout with a finger infection, the Cubs will have him test things out in game action. The right-hander is expected to work in low-leverage situations once he comes off the 10-day disabled list.