The Seahawks made a roster move ahead of their Week 13 game against the San Francisco 49ers, promoting linebacker Emmanuel Ellerbee from the practice squad to the 53-man roster. Running back C.J. Prosise was placed on injured reserve to make room on the roster.

Ellerbee, an undrafted rookie out of Rice, first joined the Seahawks in October when he was claimed off of waivers from the Los Angeles Chargers. He appeared in one game with Seattle, then was waived and re-signed to the practice squad. Prior to joining the Seahawks, Ellerbee appeared in three games with the Chargers. He initially signed as an undrafted free agent with Atlanta, spending training camp and the preseason with the Falcons before being waived prior to the start of the regular season.

Prosise, a third-round pick in 2016, had already been ruled out for Sunday's game with what Seahawks coach Pete Carroll called, "an abdomen, groin, hip-flexor thing going on." Carroll added that the injury has been lingering for a while, but recently got worse, saying, "It has really been bothering him for some time, he has been working through it, and it's just gone beyond that."