The Royals activated Kolek from the family medical emergency list Tuesday.
Kolek was away from the club for a few days while tending to a personal matter, but he's back in time to start Tuesday's contest at home versus the Rangers. The right-hander has logged a 3.32 ERA, 0.97 WHIP and 27:8 K:BB over 38 innings covering six starts for Kansas City this season.