The Lions signed Houston to the active roster Monday.
Houston joined up with the Lions' practice squad after being waived as part of the team's final roster cuts in late August. The rookie sixth-round pick was then elevated ahead of Thursday's loss to the Bills, and he recorded two sacks while playing four of his 14 snaps on defense in his NFL debut. Houston should now help provide depth at defensive end after Charles Harris (groin) was also placed on injured reserve Monday.