The San Francisco Giants placed left-handed reliever Jeremy Affeldt on the 15-day disabled list Sunday with a strained left groin.
Affeldt is expected to be shelved for up to six weeks. He said he felt and heard a pop while pitching against the Arizona Diamondbacks on Saturday.
The Giants recalled right-handed pitcher Jean Machi from Class AAA Fresno.
Affeldt, who is 1-4 with a 3.51 ERA in 33 1/3 innings over 38 appearances this year, also had a strained right oblique muscle earlier this year.