Pena was designated for assignment by the Giants on Saturday, Alex Pavlovic of CSN Bay Area reports.
Manager Bruce Bochy was forced to lean on Pena to fill a fairly regular role throughout July (52 at-bats), but with Joe Panik returning from the DL and Eduardo Nunez coming aboard from Minnesota, Pena was deemed expendable. Pena has hit .299/.330/.425 in 91 plate appearances this season and could appeal to a team in need of infield depth.