The right-hander Journell, 28, went 1-4 with a 4.68 ERA and one save in 34 relief appearances at Triple-A Memphis last season. He also made five relief appearances for the NL Central champion Cards, going 0-1 with a 10.39 ERA.
Journell was a fourth-round draft pick by the Cardinals in 1999 and had been ranked by Baseball American in 2001 as the Cardinals Top Prospect.
Journell missed most of the 2004 season, after he underwent shoulder surgery on May 17 that year for labrul debribement, missing the rest of the season.
His professional baseball career started with an injury. He had Tommy John surgery to repair ligament damage in his right elbow about a month before the June 1999 draft. He didn't pitch at all in 1999.
He was still experiencing some arm problems last season and was placed on the DL in September before being deactivated in October.
Journell never lived up to his potential with St. Louis. He will be given a chance to make a fresh start in Cincinnati with the Reds.