Washington announced Thursday it placed the veteran tackle on the reserve/non-football injury list.
Williams' protracted holdout from the team ended following the trade deadline in late October when he reported to the organization's facility after he was not dealt to a new team in October. Williams, however, has yet to practice this season as he was unable to pass a physical due to discomfort with his helmet.
Williams then told reporters Oct. 31 that he had a cancerous growth -- a rare form of soft-tissue cancer known as Dermatofibrosarcoma Protuberans -- removed from his head that had gone undiagnosed for roughly six years.
In the meantime, with Williams unable to play due to helmet discomfort associated with the removed growth, Washington deemed its best course of action was to place the tackle on the reserve/NFI list.
There's also a financial element to this situation. NFL Network Insider Ian Rapoport reported Thursday the placing of Williams on the reserve/NFI list means his season is over without him appearing in a game in 2019, and the team does not have to pay the roughly $6 million left of his salary for the year.