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Last season, Hankins appeared in all 17 games for the Seahawks and had 30 tackles, five tackles for loss and one sack.
The Mariners begin a six-game homestand Friday with three against the Blue Jays.
Mariners RHP Bryan Woo (4-1, 1.58 ERA) is scheduled to start the series finale Wednesday.
Mariners RHP Emerson Hancock (1-1, 6.62 ERA) starts the middle game of the series Tuesday night against LHP Jeffrey Springs (4-3, 4.98).
RHP Bryce Miller (2-3, 3.52 ERA) will face Athletics RHP Luis Severino (1-3, 3.30) Monday at West Sacramento.
Bryan Woo (3-1, 3.09) pitches for the Mariners versus Jack Leiter (2-0, 2.03) at Texas on Friday.
Seattle RHP Emerson Hancock (1-1, 7.71) starts Wednesday against Angels LHP Tyler Anderson (2-0, 2.60) in the finale of the two-game series.
Eleven picks address areas of concern
Investigators ruled out terrorism as a motive and said more charges are possible.
Ben Williamson was scratched from the Mariners’ lineup with back spasms.