Bailey (calf) has been ruled out for Sunday's contest against the Bills.
Considering Bailey didn't practice at all this week, it shouldn't come as a surprise that he will skip another game Sunday. This week marks his third straight absence, and the combo of Jaye Howard and Dontari Poe will likely anchor the middle and the defensive end spot left vacant by Bailey.
Ford (back) will not play in Sunday's game against the Bills.
Ford injured his back during warmups last Sunday, and it will cost him at least another week as well. Tamba Hali will continue to see the largest chunk of time at right outside linebacker, but Dezman Moses could be in line to spell him again Sunday should the veteran need rest.
Houston (knee) is believed to have only suffered a minor injury, as initial tests revealed a PCL sprain, NFL.com's Ian Rapoport reports.
Houston was forced out of Sunday's win over Buffalo with a knee injury, but seems to have avoided serious damage. While tests are reportedly ongoing, Houston thus far has only been diagnosed with a sprained PCL, which is considered minor. The All Pro linebacker's status will be updated as more information is made available, but early indications appear relatively positive.
Thomas (concussion) won't play Sunday against the Bills.
Having recorded 17 catches for 140 yards and a TD, to go along with nine carries for 34 yards and a rushing score in 10 games to date, the versatile Thomas is only of interest in deeper fantasy formats, though his absence does represent a hit to the Chiefs' Week 12 return game.
West (hamstring) is inactive for Sunday's game against the Bills.
With West inactive, Spencer Ware -- who had 96 yards and two touchdowns on 11 carries in relief of West in Week 11 - is slated to get the start at running back for the Chiefs on Sunday, while Knile Davis is active for the contest and thus an option to see complementary work.
Bray (knee) returned to practice Wednesday, Adam Teicher of ESPN reports.
Bray has been sidelined for the beginning of the 2015 season due to an ACL injury suffered while playing basketball. There's no indication of when he may return, but it's also unlikely he'll have a roster spot even when healthy.
Lynch underwent sports hernia surgery Wednesday and will be out three to four weeks, the Seattle Times reports.
Coach Pete Carroll didn't rule out that Lynch could be done for the season, but he said doctors were "very optimistic" that they fixed the issue and that Lynch can return quickly. Thomas Rawls will start while Lynch is out.
Richardson (hamstring) is expected to return to practice Wednesday, John Boyle of the Seahawks' official site reports. "He's got a great shot," head coach Pete Carroll said Monday. "We're counting on him coming back and practicing, at least in limited fashion Wednesday just to prove it, but we think he might be full-go on Wednesday."
Activated from the PUP list on Nov. 14, Richardson made his season debut in Week 10 but suffered a hamstring injury during that contest. He's subsequently missed the past two games, but an appearance in drills Wednesday would set the foundation for a return to action.