The Cardinals have optioned Kiekhefer to Triple-A Memphis, Jenifer Langosch of MLB.com reports.
Kiekhefer pitched two scoreless innings for the Cardinals since being recalled on July 26. The 27-year-old will head back to Triple-A Memphis where he sports a 2.00 ERA in 27 innings of relief work. Look for him to rejoin the team when rosters expand in September.