The White Sox claimed left-hander Daniel Moskos, a former first-round draft pick, off waivers from the Pittsburgh Pirates on Friday. Moskos, 26, was optioned to Class AAA Charlotte.

Moskos was 1-1 with a 2.96 ERA over 31 appearances with Pittsburgh last season, his first in the major leagues. He appeared in 14 games with AAA Indianapolis this season, going 1-2 with a 3.86 ERA. He spent a good portion of May on the disabled list. He was designated for assignment on June 26.

Moskos, the fourth overall pick in the 2007 draft, was 23-26 with a 4.39 ERA in 169 games over six minor league seasons.

The Sox' 40-man roster stands at 39.