Falcons safety William Moore, who reinjured his shoulder against New Orleans on Sunday, was placed on injured reserve on Tuesday.

“It’s disappointing naturally because William is a big part of what we do,” defensive coordinator Mike Nolan said. “It’s exciting when he’s in there because he creates a lot of energy.”

Moore returned from injured reserved to play against the Cardinals on Nov. 30 after missing seven games.

Safety Sean Baker was added to the active roster from the team’s practice squad.

Moore was placed on short-term injured reserve after suffering the injury against the Vikings on Sept. 28. NFL rules stipulated that he had to miss a minimum of eight weeks before playing in games.

The Falcons drafted Moore, 29, in the second round of the 2009 draft out of Missouri and he’s been a starter since his second season. Last year the Falcons signed Moore to a five-year contract that included $14 million guaranteed.

Second-year safety Kemal Ishmael will start in place of Moore.