Redskins guard Mike Williams will miss the season because of a blood clot near his heart, and his career could be in jeopardy.

Williams confirmed he would miss the season on 106.7 The Fan on Saturday after The Washington Post first reported his situation. Williams also said he would return when he has "100 percent clearance," but it's uncertain if or when that would happen.

Williams had been hospitalized for his condition.

He was going to compete with Artis Hicks for the starting job at right guard. Hicks likely would have been the favorite to win that job, but Williams' loss certainly hurts the Redskins' line depth. He could play tackle or guard and likely would have been the top backup at both spots.

The Redskins signed Williams in April 2009 when he weighed approximately 410 pounds. He has lost about 80 pounds since then. Though he struggled to stay on the field last summer, he showed enough to land a roster spot, eventually switching from tackle to guard. He started eight games last season between right guard and right tackle.

Williams was the fourth overall pick in 2002, but injuries forced him out of the game after the 2005 season. He didn't play again until this past year.