Philadelphia Phillies ace Zack Wheeler underwent a "successful thrombolysis procedure to remove a blood clot in his right upper extremity" on Monday, the team announced. Further treatment and a recovery timetable are still be determined.

"We don't know the timeline," manager Rob Thomson said this past weekend ( via MLB.com ). "I'm thinking a lot about Zack and his family because this is not a hamstring injury or something like that."

Zack Wheeler PHI • SP • #45 ERA 2.71 WHIP .94 IP 149.2 BB 33 K 195 View Profile

Wheeler, 35, was placed on the injured list Sunday . He recently had a start pushed back by shoulder soreness, though it is unclear if that is related to the blood clot. Wheeler went down right as Aaron Nola returned from a three-month absenc

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