Karros has cleared concussion protocol and will begin a rehab assignment with Double-A Hartford on Thursday, Eli Whitney of Blake Street Banter reports.
Karros has been on the 7-day injured list twice since mid-August, which is worrisome, but he appears to be in the clear now. He is slated to remain with Hartford through the end of the weekend. If all goes well, Karros appears poised for a return to the Rockies' active roster next week as the club begins a road trip.