Carpenter (foot) was activated off the 10-day injured list Sunday. He'll start at the hot corner and bat leadoff in the Cardinals' series finale in Oakland.
Carpenter has been sidelined with the bruised right foot since mid-July but is set to make his return after a nine-game rehab assignment. The veteran third baseman struggled in the minors and went 2-for-26, but he'll look to turn things around after posting a .693 OPS and career-high 25.7 percent strikeout rate in his first 81 major-league games this season.