Kahnle was recalled from Triple-A Charlotte on Friday.
Kahnle heads back to Chicago after spending the past month in Charlotte. He returns to the White Soxs after Daniel Webb was placed on the 15-day DL. In nine innings pitched with Charlotte, Kahnle recorded a 3.00 ERA with 12 strikeouts and a save. The 26-year-old will add bullpen depth for the White Soxs as they continue their series with the Orioles through the weekend.