The Athletics announced that they designated left-hander Brian Fuentes for assignment. The team reinstated right-hander Bartolo Colon from the disabled list in a related move.

Fuentes, 36, 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). In 25 innings for the Athletics this year he posted a 6.84 ERA with 6.5 K/9 and 3.6 BB/9. A trade involving Fuentes could still occur within the next ten days.