Spiller, 29, is a former first-round pick of the Bills back in in 2010. He spent five years in Buffalo before signing a four-year, $16 million contract that included $9 million guaranteed with the Saints.
Spiller was set to make a base salary of $1.7 million for the 2016 season when the Saints cut him loose last Tuesday. The Seahawks signed him to a contract over a month ago.
In 2016, Spiller appeared in two games for the Seahawks and ran for nine yards on three carries to go along with five receptions for 43 yards receiving and one touchdown.
Tukuafu, 32, originally signed on with the Seahawks as an undrafted free agent out of Oregon back in 2010. However, he lasted just a few months in Seattle before he was cut and later signed by the 49ers.
After three years in San Francisco, Tukuafu returned to the Seahawks during the 2014 season and remained with Seattle through the 2015 season. The Seahawks cut Tukuafu loose a few weeks into the regular season.
In 2016, Tukuafu has been active for one game.