The Royals placed Junis (back) on the 10-day injured list Sunday.
Junis hasn't progressed as well as the Royals had hoped after he experienced back spasms Saturday, resulting in a scratch ahead of his scheduled turn as a primary pitcher against the Twins in the first game of a doubleheader. Kansas City opted for a bullpen game instead, making it unclear whom might replace Junis in the rotation when a new fifth starter is next required Wednesday against the Reds.