The Pirates acquired Jefferies from the Giants on Friday in exchange for Rodolfo Nolasco, Andrew Baggarly of The Athletic reports.

The Giants designated Jefferies for assignment Monday.

The Giants recalled Jefferies from Triple-A Sacramento on Sunday, Shayna Rubin of the San Francisco Chronicle reports.

The Giants optioned Jefferies to Triple-A Sacramento on Thursday, Andrew Baggarly of The Athletic reports.

The Giants recalled Jefferies from Triple-A Sacramento prior to Wednesday's game against the Red Sox in Boston.

Jefferies is expected to start Wednesday's game in Boston, Shayna Rubin of the San Francisco Chronicle reports.

Jefferies was optioned to Triple-A Sacramento on Monday.

Jefferies left his start against the Padres on Sunday a little worse for wear, dealing with left hip discomfort, Susan Slusser of the San Francisco Chronicle reports.

Jefferies had his contract selected by the Giants ahead of his start against the Padres on Sunday, Alex Pavlovic of NBC Sports Bay Area reports.

Jefferies will be called up to start for the Giants on Sunday in San Diego, Maria I. Guardado of MLB.com reports.