Kam Chancellor likely headed to IR with neck injury

— -- Seattle Seahawks safety Kam Chancellor likely is headed to injured reserve and will miss the remainder of the season, a source told ESPN's Josina Anderson on Saturday.

The eight-year veteran?left last week's game against Arizona with a neck injury on the Cardinals' final possession. Coach Pete Carroll said earlier this week that he suffered neck stingers -- plural -- but was still undergoing testing.

Chancellor, who has 49 tackles and a forced fumble this season, did not practice Thursday or Friday. The hard-hitting safety has 12 career interceptions.

Bradley McDougald, who is Seattle's primary backup at both safety spots and has started the past two games at free safety, would start for Chancellor at strong safety against the Atlanta Falcons on Monday night.

The Seahawks (6-3) are one game behind the NFC West-leading Los Angeles Rams, and they are currently the sixth-seed in the NFC playoff standings -- one game ahead of four teams.

Seattle's secondary already is without Richard Sherman, who suffered a ruptured Achilles tendon in last week's victory over Arizona and is out for the season. Earl Thomas is expected back this week from a hamstring injury.

ESPN's Brady Henderson contributed to this report.