Singleton was scratched from the lineup for Sunday's game against the Angels due to an illness, Brian McTaggart of MLB.com reports.
Victor Caratini will step in at first base and bat fifth in place of Singleton, who will wind up hitting the bench for a third straight game after going 3-for-4 with two doubles in his last start Thursday versus the Athletics. The lefty-hitting Singleton should see the bulk of the starts at first base against right-handed pitching over the final two weeks of the season.