The Royals acquired McGee from the Brewers in exchange for cash considerations Tuesday and subsequently optioned him to Triple-A Omaha.
The right-hander was designated for assignment by Milwaukee on Friday, and Kansas City elected to trade for him rather than risk a waiver claim. McGee covered a scoreless frame in both of his appearances for the Brewers this season but struggled to a 5.62 ERA, 1.60 WHIP and 43:17 K:BB across 41.2 innings at Triple-A.