The Seattle Seahawks placed defensive tackle Jesse Williams on injured reserve Monday with a knee injury.

Williams, one of three fifth-round draft picks by Seattle, was unable to practice more than a few days in a row before having to take at least a day off throughout training camp. He played in the team's first two preseason games and started their opener against San Diego, but didn't record a tackle.

Seattle also terminated the contract of wide receiver Brett Swain and waived receiver Perez Ashford, linebackers Kyle Knox and Craig Wilkins, long-snapper Kyle Nelson, tight ends Jameson Konz and Andrei Lintz and defensive tackle Martin Parker.

Defensive tackle Jordan Hill is sidelined with a strained biceps and nose tackle Brandon Mebane injured his groin in practice on Monday.

Chris Clemons remains on the physically unable to perform list and his timetable to return from an ACL tear last January remains uncertain and Cliff Avril aggravated a hamstring strain last week and has yet to play this preseason.

Seattle still needs to make six additional moves to get under the league-mandated 75-man limit by Tuesday.