Washington Redskins offensive lineman Trent Williams has been put on the Reserve/Non-Football Injury List, the team announced Thursday.

Placing Williams on the list ends his season, and it also means the Redskins will not have to pay Williams around $6M on his remaining salary:

This is just the latest move in a battle between these two sides.

After many great and productive seasons with the Redskins, Williams claimed that for years team doctors did not take his complaints seriously about a growth that developed on his head. It turned out to be dermatofibrosarcoma protuberans, a rare form of cancer. According to Williams, the cancer could have been life threatening if not treated in time.

This sparked Williams' holdout, and he was unable to return to the field after he felt discomfort attempting to put on his helmet in result of the growth on his head.

According to Ian Rapoport, the team will look to trade Williams after the season:

Situations like this have been a reason for why fans have called for members of the Redskins' front office to be fired. Washington is currently 1-8 with interim head coach Bill Callahan.

Williams is a seven-time Pro Bowler and had never missed more than six games in a single season before this one. Despite being 31, Williams will have many suitors when the Redskins attempt to trade one of the best left tackles in the game.

Washington will continue to play veteran left tackle Donald Penn at Williams' position.