The Chiefs knew earlier this offseason that outside linebacker Justin Houston was unlikely to be ready for the regular season.
Today was just the filing of the paperwork.
Via Field Yates of ESPN, the Chiefs are putting Houston on the reserve/physically unable to perform list. That will keep him off the field at least the first six weeks of the season.
Houston needed surgery in February to repair his ACL, and the timetable was placed at six to 12 months. Only the most optimistic recovery would have had him ready by now.
The Chiefs will also be without linebacker Josh Mauga, who will be placed on injured reserve with a labral tear in his hip, per Terez Paylor of the Kansas City Star.