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Royals prospect Kyle Zimmer remains in extended spring training after ‘arm fatigue’

As the Royals broke camp last week and assigned players to their minor-league affiliates, one name was conspicuously absent from a roster: Top pitching prospect Kyle Zimmer remains in extended spring training after experiencing some “arm fatigue,” assistant general manager J.J. Picollo told The Star.

Zimmer is expected to continue throwing side sessions in a controlled environment as club officials inspect his progress. Picollo said there was no specific timetable for his departure from the Royals’ complex in Surprise, Ariz.

“He’s truly day to day,” Picollo told The Star in a text message. “As long as he’s comfortable, we will move him forward but it’s tough to put a time frame on it.