The Royals reinstated Kolek (personal) from the family medical leave list and placed on the 15-day injured list Sunday due to a right flexor strain.
The right-hander has spent most of the past few weeks on the paternity and family medical emergency list, and he appeared close to rejoining the Royals when he began a rehab assignment Saturday. Kolek presumably sustained the injury in his start with Triple-A Omaha, during which he surrendered two earned runs on six hits with a 3:0 K:BB over 2.2 innings. The Royals haven't provided a timeline for the 29-year-old to return from the forearm injury.