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Philadelphia Phillies star Zack Wheeler was placed on the 15-day injured list on Saturday night as the team revealed he had a “right upper extremity blood clot.”

The details of Wheeler’s injury were scant on Saturday night.

Dave Dombrowski, the Phillies’ president of baseball operations, said there wasn’t a lot of information to give about Wheeler’s issue, but it would be evaluated further in Philadelphia. Paul Buchheit, the team’s head athletic trainer, said Wheeler experienced “heaviness” in his arm and that doctors were called upon to properly diagnose Wheeler.

It’s unclear whether the clot was in an artery or a vein.

Dr. Michael Jacobs, a retired team physician who previously worked for the Baltimore Orioles, explained to Fox News Digita

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