The Cardinals are interested in trading for Athletics left-hander Brian Fuentes, reports Jon Heyman of CBSSports.com (via Twitter). Oakland designated the reliever for assignment on Tuesday after he posted a 6.84 ERA with 6.5 K/9 and 3.6 BB/9 in 26 appearances.

The Cardinals currently have two left-handers in their bullpen but could benefit from adding Fuentes to the mix as Marc Rzepczynski (5.52 ERA) has struggled and Barret Browning has only pitched 4.1 innings in his entire Major League career. Fuentes, 37 in August, is in the second year of a two-year, $10.5MM contract he signed following the 2010 season. He'll earn $5MM this year and his contract includes a $6.5MM club option for 2013 ($500K buyout).