KANSAS CITY, Mo. (AP) — The Chiefs have placed Justin Houston on the physically unable to perform list and put fellow linebacker Josh Mauga on injured reserve as they trimmed down to the NFL’s roster limit. Houston is still recovering from surgery in February to repair a non-functioning ACL in his left knee. He will continue his rehab and be evaluated by Dr. James Andrews during the Chiefs’ bye week in early October with the hope that he will play at some point this season.