Kansas City made the announcement on Monday, ahead of the MLB clash against the Toronto Blue Jays.
Duffy – a World Series champion in 2015 – last pitched in the Royals’ 8-3 loss to the St Louis Cardinals on Saturday and was poised to start on Thursday.
Instead, Kansas City will start Glenn Sparkman, who was recalled from Triple-A Omaha. He will face his former team the Blue Jays.
Duffy is eligible to return on August 23. The 29-year-old started 25 games for Kansas City and is 7-11 this year with a 4.90 ERA.
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