Chapman will undergo another MRI on Monday since his abdominal strain remains bothersome when running, Susan Slusser of the San Francisco Chronicle reports.
The 33-year-old isn't believed to have suffered a setback, but he can't quite get over the hump in his recovery. Though manager Tony Vitello said Wednesday that Chapman was expected to come off the injured list during this weekend's series in San Diego, the veteran third baseman will instead be out a bit longer. Christian Koss and Oslevis Basabe have been sharing time at third base lately, and waiver pickup Buddy Kennedy could also factor into the mix for reps at the position while Chapman remains shelved.