The White Sox officially moved Liam Hendriks to the 60-day injured list, the team announced on Thursday.
They claimed right-handed pitcher Deivi García off the New York Yankees waivers in a reciprocating move.
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The White Sox announced Hendriks' season-ending surgery on Aug. 2. The recovery time is expected to take 12-14 months, according to the team.
The closer hasn't pitched since June 9. He was placed on the 15-day injured list on June 11 with right elbow inflammation.
This season, Hendriks has pitched five innings, holding a 5.40 ERA. He is 2-0 with three strikeouts and one save since returning this season from a battle with cancer dating back to December 2022.
García, 24, is predominantly a minor league pitcher.
White Sox News
He's pitched in 28 games in relief for the Yankees' Triple-A team this season, and two in the big leagues. He holds a 5.67 ERA in the minors. He will be transferred to the White Sox Triple-A affiliate, the Charlotte Knights.