Hernaiz is out of the lineup for Sunday's game against the Blue Jays.
Hernaiz had started in each of the last three games, but he'll likely move back into more of a utility role after Seth Brown returned from the paternity list Saturday. In Sunday's series finale, the Athletics will roll out an infield of Brown at first base, Zack Gelof at second base, Max Schuemann at shortstop and Abraham Toro at third base, and that will likely be the team's preferred configuration against right-handed pitching going forward.