Altavilla opted out of his minor-league contract with the Royals on Wednesday and is now a free agent, Jon Heyman of the New York Post reports.
Altavilla has made 38 appearances this season at the Triple-A level between the Twins and Royals organization, logging a 6.09 ERA and 36:33 K:BB over 44.1 frames. The 33-year-old will likely need to accept a minor-league contract as he seeks employment in a new organization.