The Giants designated right-handed reliever Juan Gutierrez for assignment Thursday evening and added four minor leaguers to their 40-man roster to protect them from the upcoming Rule 5 Draft, the team announced on Twitter.
San Francisco purchased the contracts of starting pitcher Joan Gregorio and relievers Cody Hall, Ray Black and Derek Law.
Gregorio, 22, is a 6-foot-7, 180-pound right-hander who posted a 4.37 ERA and struck out 92 batters over 90 2.3 innings split between Low- and High-A ball last year.
Hall, 26, stands 6-foot-4 and weighs 220 pounds. He logged a 1-4 record with 11 saves, a 3.14 ERA and 57 stirkeouts to 14 walks over 51 2/3 innings playing for the Double-A Richmond Flying Squirrels last season.
Black, 24, is a 6-foot-5, 225-pound righty that struck out 71 batters over 35 1/3 innings of relief split between Low- and High-A ball last year.
Law, 24, underwent Tommy John surgery in June after posting an impressive 2.57 ERA and 217 strikeouts in 167 career minor league innings. He's expected to be out until around midseason next year.
Gutierrez, 31, went 1-2 with a 3.96 ERA in 61 games, helping the giants to their third World Series title in the last five years. He owns a 7-17 record and 4.49 ERA over a six-year MLB career.