The Giants optioned Bivens to Triple-A Sacramento on Sunday, Alex Pavlovic of NBC Sports Bay Area reports.
Bivens was called up by the Giants last weekend and appeared in two games during his week in the majors, giving up two unearned runs on three hits with a 3:1 K:BB over two innings. Jason Foley (shoulder) was reinstated from the injured list to fill out San Francisco's bullpen.