Ellington (toe) is merely considered day-to-day, but his availability for Sunday's game against the Rams remains in serious question, NFL.com's Ian Rapoport reports.
With Chris Johnson (leg) potentially out for the rest of the regular season, Ellington could find his way to an increased role in the coming weeks, if he's able to get healthy. However, his injury history is far from encouraging, and the recovery time from turf toe can vary from a few days to multiple months. For Week 13, it appears David Johnson will lead the Arizona backfield, though Ellington hasn't yet been ruled out.
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.