Leone had his 2024 season end due to a UCL sprain in his throwing elbow. The 33-year-old pitched for 11 seasons for nine MLB clubs, and he finished his career with a 3.94 ERA over 429 innings with those teams.

Leone had just returned from the injured list on August 5 after missing the first four months of the season due to elbow inflammation. He’s now shut down indefinitely and could be looking at Tommy John surgery. Matt Foster was activated from the injured list to take his place in the White Sox’ bullpen.

Leone had been out since late May with elbow inflammation. In four rehab appearances, he allowed two runs and posted a 7/0 K/BB ratio in four innings for Triple-A Charlotte. He might well emerge as the favorite for saves in the White Sox pen, though that doesn’t make him worth picking up right now.

The procedural move opens up a spot on Chicago’s 40-man roster for top pitching prospect Drew Thorpe. Leone has been on the shelf since late May due to right elbow inflammation and remains without a timetable to return.