The Red Sox optioned Anderson to Triple-A Worcester on Saturday, Ari Alexander of 7 News Boston reports.
Anderson was recalled from Triple-A on Friday, but Justin Slaten's (oblique) return from the injured list Saturday will cause Anderson to return to the WooSox without appearing for the big club. The 26-year-old righty has surrendered three earned runs in eight innings with Boston and owns a 4.50 ERA through 18 frames in the minors.