Christine Michael was released by the Cowboys last month.
Michael had 51 yards in five games for the Cowboys before being released last month.
Michael was selected by the Seahawks in the second round of the 2012 NFL draft before being traded to the Cowboys before the season. He played 14 games and rushed 52 times for 254 yards as Lynch's backup for two seasons.
The Seahawks are 8–5 on the year and sit in second place in the NFC West division. They will take on the Cleveland Browns on Sunday.
- Christopher Chavez