A shoulder injury had Carpenter out since the start of the season and he eventually had surgery in July.
The Cubs don’t plan on feeling sorry for the veteran, whose 144 career victories rank 14th among active pitchers.
“I’m sure he’s not here unless he’s back to normal,” Cubs manager Dale Sveum said. “He might not be 100 percent but I’m sure he’s 90 percent with all his pitches or he wouldn’t be here down the stretch for these last 12, 13 games so I don’t think you approach him any different.”
To make room for Carpenter, former Cubs pitcher John Gaub was removed from the Cardinals’ 40-man roster.