Maile was optioned to Triple-A Nashville on Friday, Tom Haudricourt of the Milwaukee Journal Sentinel reports.
The 30-year-old joined Milwaukee on a major-league deal in December but won't open the season on the roster after going 1-for-9 with four strikeouts in five spring games. Maile may have a hard time cracking the big-league roster this season with Omar Narvaez, Manny Pina and Jacob Nottingham (thumb) still in the mix.