The Chiefs signed Buechele from their practice squad to their 53-man roster Tuesday, Field Yates of ESPN reports.
Patrick Mahomes and Chad Henne are both healthy, so on the surface this comes as a surprising move. However, Yates reports that the Cardinals -- who currently have injuries to Kyler Murray (ankle) and Colt McCoy (pectoral) -- attempted to sign Buechele to their active roster, so the Chiefs are merely protecting their practice squad quarterback.