![This is a 2023 photo of pitcher Daulton Jefferies of the Oakland Athletics baseball team. This image reflects the Oakland Athletics active roster as of Thursday, Feb. 23, 2023, when this image This is a 2023 photo of pitcher Daulton Jefferies of the Oakland Athletics baseball team. This image reflects the Oakland Athletics active roster as of Thursday, Feb. 23, 2023, when this image](https://c8.alamy.com/comp/2NK8MT2/this-is-a-2023-photo-of-pitcher-daulton-jefferies-of-the-oakland-athletics-baseball-team-this-image-reflects-the-oakland-athletics-active-roster-as-of-thursday-feb-23-2023-when-this-image-was-taken-in-mesa-ariz-ap-photomatt-york-2NK8MT2.jpg)
This is a 2023 photo of pitcher Daulton Jefferies of the Oakland Athletics baseball team. This image reflects the Oakland Athletics active roster as of Thursday, Feb. 23, 2023, when this image
![Oakland A's injuries: Daulton Jefferies will have surgery for thoracic outlet syndrome - Athletics Nation Oakland A's injuries: Daulton Jefferies will have surgery for thoracic outlet syndrome - Athletics Nation](https://cdn.vox-cdn.com/thumbor/HbsazGiVDFzek_nVFOxOZbkSJfE=/1400x1400/filters:format(jpeg)/cdn.vox-cdn.com/uploads/chorus_asset/file/23418736/usa_today_18122338.jpg)
Oakland A's injuries: Daulton Jefferies will have surgery for thoracic outlet syndrome - Athletics Nation
![Oakland Athletics starting pitcher Daulton Jefferies (66) throws against the Toronto Blue Jays during first inning American League action in Toronto on Friday, April 15, 2022. THE CANADIAN PRESS/Frank Gunn Stock Photo - Alamy Oakland Athletics starting pitcher Daulton Jefferies (66) throws against the Toronto Blue Jays during first inning American League action in Toronto on Friday, April 15, 2022. THE CANADIAN PRESS/Frank Gunn Stock Photo - Alamy](https://c8.alamy.com/comp/2J4MDNT/oakland-athletics-starting-pitcher-daulton-jefferies-66-throws-against-the-toronto-blue-jays-during-first-inning-american-league-action-in-toronto-on-friday-april-15-2022-the-canadian-pressfrank-gunn-2J4MDNT.jpg)