The Rangers placed Diekman on the 15-day disabled list Friday with a cut on his left index finger, Jeff Wilson of the Fort Worth Star-Telegram reports.
Diekman cut his finger Wednesday before the All-Star break and will still need a few more days to recover, so the team decided to place him on the disabled list to open up a roster spot for fellow reliever Keone Kela. Diekman last pitched July 6, so he will be eligible to be activated as soon as next Thursday.