The Pittsburgh Pirates placed right-handed reliever Isaac Mattson on the 15-day injured list before Tuesday's game against the White Sox with right hip inflammation. In a corresponding move, the Pirates recalled left-hander Brandon Eisert from Triple-A Indianapolis. Mattson has no record with a 5.35 ERA in 38 2/3 innings over 38 games this season, his fourth in the majors and third with the Pirates.