PHILADELPHIA -- Phillies ace Zack Wheeler had surgery Monday to remove a blood clot in his upper right arm, and the team said a timeline for his recovery remains uncertain.

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

Wheeler, 35, was placed on the 15-day injured list Saturday with a blood clot after experiencing worsening shoulder soreness.

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