Zack Wheeler suffers injury: How long will Phillies’ ace be sidelined with Thoracic Outlet Syndrome?

Zack Wheeler has been a cornerstone of the Philadelphia Phillies’ strategy this season. Known for his powerful throws and cohesive play, Wheeler’s presence on the mound will be sorely missed following his diagnosis with thoracic outlet syndrome, an injury that has sidelined him indefinitely.

The team reported that Wheeler will require surgery to address the condition, sending shockwaves through Philadelphia. Despite the Phillies’ strong performance in the regular season, Wheeler’s absence raises concerns among teammates and fans about the duration of his recovery.

Initially considered a minor issue, Wheeler’s condition was confirmed to be more serious. According to the Mayo Clinic, thoracic outlet syndrome is “a group of disorders that occur when blood vessels or nerves in the space between your collarbone and your first rib (thoracic outlet) are compressed.” This medical explanation underscores the gravity of Wheeler’s diagnosis.

The condition can lead to “compression of blood vessels and nerves that can cause pain in the shoulders and neck, and numbness in the fingers,” according to the Mayo Clinic. This has understandably caused concern among the Phillies’ fan base.

Zack Wheeler #45 of the Philadelphia Phillies pitches against the Texas Rangers during the second inning at Globe Life Field on August 10, 2025 in Arlington, Texas.

How long will Wheeler be sidelined with Thoracic Outlet Syndrome?

Zack Wheeler is expected to be out for the remainder of the current season. Post-surgery, he faces a recovery period ranging from 6 to 8 months, which projects his return to professional play around April next year.

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Though this is a serious injury with challenging symptoms, there is optimism about Wheeler’s return to the Phillies’ lineup next season, contingent upon his continued association with the team. Philadelphia remains hopeful, bolstered by their impressive performance this season.

In his 24 appearances this season, Wheeler was a standout performer, posting exemplary numbers including a league-leading 195 strikeouts. He also topped the league with a 11.7 strikeouts per nine innings (SO/9), across 149.2 innings pitched, allowing just 19 home runs, 48 runs, and 109 hits.