With rosters eligible to be expanded as of Thursday, the White Sox activated A.J. Pierzynski from the disabled list, added infielder Eduardo Escobar and purchased the contracts of right-handers Shane Lindsay and Addison Reed.
Pierzynski has been out since Aug. 13 with a fractured left wrist. He played in three rehab games this week with Triple-A Charlotte.
Linsday, 26, posted a 2.18 ERA with 90 strikeouts in 50 appearances at Double-A Birmingham and Triple-A Charlotte. One concern is the 59 walks allowed by the Australia native in 70 1/3 innings. He will be the first Australian-born player to appear with the White Sox.
Reed, 22, has been a revelation while posting eye-popping numbers for four different White Sox minor-league clubs this season. The third-round pick in last year's draft out of San Diego State, led all minor-league relievers with 111 strikeouts. He had a combined 1.26 ERA in 43 appearances.
Escobar, 22, who was being mentored by Omar Vizquel the entire spring, batted just .266 over 137 games, but his defense is well above average. He played a majority of games at shortstop, while also getting in some time at second base.
Left-hander Hector Santiago had also been considered for a spot on the expanded roster, but he will stay at Double-A Birmingham for now. The Barons' regular season ends Monday and they will open the playoffs at home Thursday against Mobile.
The White Sox's 40-man roster is now full with 29 players now active.
Doug Padilla covers the White Sox for ESPNChicago.com and ESPN 1000.