The Falcons have signed defensive lineman Ahtyba Rubin, according to Ian Rapoport of NFL.com (on Twitter). Rubin became a free agent on Tuesday when he was released by Denver. 
Rubin was set to enter the final year of a three-year, $12MM deal with the Seahawks this year. Instead, he was cut in early September. The Broncos signed him later on that month, but he was cut loose after dressing just twice.
In his first Seahawks season (2015), Rubin amassed 36 tackles, two sacks, and finished fourth among the team’s defensive linemen in snaps. Last year, he once again had a perfect attendance record in the regular season as he racked up 39 tackles, one sack, and three forced fumbles. However, he wasn’t quite living up to the standards of his deal in Seattle.
With the Falcons, Rubin will help provide depth in the wake of injuries to starting defensive end Courtney Upshaw and reserve defensive tackle Jack Crawford. Upshaw did return to practice this week, so there is hope for him to play on Sunday against the Patriots. Crawford, however, is on IR.