Houston (knee) was moved to the regular-season PUP list Tuesday, ruling him out for the first six weeks of the year, NFL.com's Ian Rapoport reports.

Houston was always a long shot to be ready early in the season, as his February surgery came with a recovery timeline of 6-12 months. The Chiefs do still hope to have him available by mid-year, with Houston capable of making a huge impact even if he has to be eased back into action.