Peña was signed to a minor league deal in June after injuries to Prince Fielder, Mitch Moreland, Jim Adduci and Kevin Kouzmanoff. He was called up from Triple A Round Rock a week later and played in 18 games for the Rangers in June and July, hitting .136 with one home run.
In 20 games for Round Rock, Peña hit .297 with an .850 OPS and four home runs.
Peña, 36, was originally drafted by the Rangers in 1998 and made his MLB debut with the team in 2001. In 14 seasons, the veteran has hit .232 with 286 home runs. He last played a full season in the majors in 2012 with the Rays, the team he made his lone All-Star appearance with in 2009.
The Rangers were 48-76 entering Monday, in last place in the American League West.
- Ben Estes