According to Jeff Duncan of the T-P, the Saints have placed WR Rod Harper on injured reserve. Harper had been missing practice with an ankle injury. Harper made the team after a strong preseason of two special teams touchdowns but had yet to be active in a game.
The Saints re-signed QB Chase Daniel, picked up after he was cut from the Redskins' training camp roster. Daniel has been bouncing from practice squad to 53-man roster so far this year, but the Saints apparently think highly of him.
The Saints are now sporting a third kicker (Garrett Hartley) and a third quarterback (Daniel) on the 53-man roster, an indication of the confidence they have in their depth and the relative health of the team.
Both will be inactive on Sunday, though Daniel gets to dress and can play as the emergency quarterback.
UPDATE: Daniel himself has confirmed: "Back on active roster! Excited for the game! Go Saints!"