The Rangers optioned Otto to Triple-A Round Rock on Sunday.
Otto will cede his spot on the 26-man active roster and in the bullpen to right-hander Owen White, who was called up from Triple-A in a corresponding move. After being activated from the 60-day injured list June 30, Otto made four relief appearances and gave up 10 earned runs on 10 hits and five walks over 8.1 innings.