Speaks has worked out for the Seahawks since becoming available.
Speaks, 24, is a former second-round pick of the Chiefs back in 2018. He was entering the third year of his four-year, $6,110,516 rookie contract when the Chiefs cut him loose this offseason.
Speaks spent last season on injured reserve after sustaining a torn ACL and also served a four-week suspension.
In 2018, Speaks appeared in all 16 games for the Chiefs and recorded 24 tackles, 1.5 sacks, a forced fumble and two recoveries.