Williams signed a three-year, $18 million deal with the Seahawks in March to replace Byron Maxwell, who left via free agency.
The 30-year-old started the first 10 games of the season, even scoring a touchdown in the opener, but has been a healthy inactive the last two weeks, according to Danny O'Neil of 710 ESPN Seattle (via MyNorthwest.com).
In Sunday's 38-7 win over the Minnesota Vikings in Minneapolis, the Seahawks went with Richard Sherman, DeShawn Shead, Jeremy Lane and Marcus Burley at cornerback.
Defensive coordinator Kris Richard indicated Monday that Williams had lost his starting job, per Bob Condottaof the Seattle Times.