Andrus was in the starting lineup for Oakland's game against the Chicago White Sox. He was placed on the paternity list on Saturday.
Andrus entered Tuesday batting .231 with three homers and 28 RBI in 113 games.
Infielder Vimael Machín was optioned to Triple-A Las Vegas to make room on the roster. Machín is batting .107 in 13 games over three stints with the A's this year.