There is known to be some level of interest from the Cubs.
Duffy, 28, registered a 3.81 ERA, 1.257 WHIP, and 130/41 K/BB ratio across 146 1/3 innings (24 starts) this past season for the Royals.
Zimmer has dealt with shoulder issues for a few years and had thoracic outlet surgery last summer.
The Royals are calling his removal from the game precautionary, but it's certainly not an encouraging development.
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The Royals had called Zimmer's removal from a start last Thursday precautionary, but they're not going to take any chances especially with the righty's history of shoulder issues.
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Aflac has also been included in both Forbes magazine's Platinum 400 List of America's Best Big Companies and in Fortune magazine's listing of America's Most Admired Companies for five consecutive years.
He underwent surgery in October to remove a loose body from his left elbow but is expected to be 100 percent by the beginning of spring training.
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The 2012 first-rounder has thrown just 84 innings dating back to the start of 2014.
Kansas City seems headed for an aggressive organizational rebuild, so Duffy could be on the move this winter even after inking a five-year, million contract extension just 11 months ago.