The St. Louis Cardinals activated right-hander Mike Mayers from the 60-day injured list on Tuesday and designated left-hander Chasen Shreve for assignment.
St. Louis also announced that third baseman Matt Carpenter (foot) will start a rehab stint with Triple-A Memphis on Tuesday night. Carpenter 33, suffered his injury on July 15 when he fouled a pitch off his right foot. He is batting .215 with 10 homers and 29 RBIs.
Mayers (shoulder) last pitched for the Cardinals on April 15. The 27-year-old went 0-1 with a 5.40 ERA in eight appearances prior to the injury.
The 29-year-old Shreve was 1-0 with a 9.00 ERA in three games with St. Louis.