The Rangers transferred Mahle (shoulder) to the 60-day injured list Tuesday.
Mahle was already ruled out for the rest of the season earlier in the month, so his move to the 60-day IL will simply create space on the 40-man roster for Matt Duffy, whose contract was selected from Triple-A on Tuesday. Mahle will celebrate his 30th birthday on Sunday, and he figures to be ready for the start of next season.