PHILADELPHIA (AP) — Phillies ace Zack Wheeler had surgery Monday to remove a blood clot in his upper right arm, and the team says a timeline for his recovery remains unknown.

Manager Rob Thomson acknowledged the uncertainty, saying, “We don’t know,” when asked whether Wheeler would pitch again this season, or if the situation was career-threatening.

The Phillies said Wheeler underwent a thrombolysis procedure by Dr. Paul DiMuzio at Thomas Jefferson University Hospital.

Wheeler, 35, a three-time All-Star currently leading the majors with 195 strikeouts, was placed on the injured list Saturday after experiencing worsening shoulder “heaviness” following his start in Washington the previous night.

His condition fell under the realm of thoracic outlet syndrome, a known risk for overhead

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