San Francisco Giants left-handed reliever Jeremy Affeldt has a strained right oblique and was placed on the 15-day disabled list.
The Giants recalled right-hander Jean Michi from Triple-A Fresno. Michi has pitched five scoreless innings this season.
Affeldt had a 5.79 ERA in six appearances this season and experienced tightness in his side during the weekend series against the Chicago Cubs. The injury was revealed when Affeldt required an MRI exam.
Manager Bruce Bochy said Tuesday at Milwaukee that he wasn't certain when a timeframe for Affeldt's return would be known.