BALTIMORE -- Switch-pitcher Pat Venditte is back with the A's, who also summoned right-hander Dan Otero from Triple-A Nashville for a double dose of relief help Saturday.
Lefty Brad Mills, who tossed five innings in a spot start Friday, was designated for assignment, while right-hander Aaron Brooks was optioned to Nashville to make more room on the roster.
Venditte is beginning his second stint with Oakland this year. He made his big league debut June 5 in Boston, tossing two scoreless innings while becoming the first full-time switch-pitcher in the modern era of MLB.