The Falcons placed Abdullah (hamstring) on injured reserve Saturday, Tori McElhaney of the team's official site reports.
Abdullah was already ruled out for Sunday's game against the Ravens, but his hamstring injury is severe enough for him to warrant a stint on injured reserve. He'll be required to miss at least the next four games, so the earliest Abdullah can return is Week 9 against the Bengals on Sunday, Nov. 8.