Ingram injured his heel during last week's 62-7 rout of the Indianapolis Colts. Saints coach Sean Payton said Friday that the injury would keep Ingram out of Sunday's matchup against the St. Louis Rams.
Ivory (foot) was activated from the physically unable to perform list Saturday. Ivory rushed for 716 yards and five touchdowns last season, averaging 5.2 yards per carry.
Rams starting cornerback Justin King (groin) was inactive after being questionable, and cornerback Marquis Johnson has been elevated from the PUP list. The winless Rams lost their two starting cornerbacks earlier in the season.
Offensive tackle Jason Smith and defensive tackle Darell Scott also are out with concussions for St. Louis.
Visit www.nfl.com/inactives to see inactive players in every Sunday game.
The Associated Press contributed to this report.