Seattle also placed G Demetrius Knox on the non-football injury list.
Blair, 21, was selected in the second round of this year’s draft by the Seahawks. He agreed to a four-year, $6,236,648 that includes a $2,545,998 signing bonus.
During his college career at Utah, Blair recorded 106 tackles, two interceptions, a forced fumble, a recovery, a defensive touchdown and four pass defenses over the course of two seasons and 22 games.
Burr-Kirven, 21, was selected in the fifth round of this year’s draft by the Seahawks. He agreed to a four-year, $2,861,613 that includes a $341,613 signing bonus.
During his college career at Washington, Burr-Kirven recorded 338 tackles, four sacks, six forced fumbles, three recoveries, 10 pass defenses and four interceptions over the course of four seasons and 47 games.