The Brewers placed Houser (elbow) on the 15-day injured list Friday with a right flexor strain.
With the Brewers labeling Houser's elbow injury as a strain rather than soreness, he seems likely to miss more than the minimum 15 days and could be sidelined through the All-Star break. Aaron Ashby (forearm) is on track to be activated from the IL on Saturday and should fill Houser's spot in the rotation.