The film, which chronicles the Great Flood, is scheduled to hit cinemas in March (14), but that hasn't stopped the filmmaker from adding to his cast.
Announcing the news on Twitter.com, Aronofsky wrote, "just added the legend Nick Nolte as the watcher samyaza".
The veteran replaces Breaking Bad star Mark Margolis as Samyaza, the leader of the watcher angels.
Noah star Russell Crowe has already seen the finished film, minus Nolte's scenes, and he's a big fan.
In a tweet earlier this month (Jan14), he wrote, "Saw @DarrenAronofsky #Noah last night. Powerful piece of cinema. Hit me very hard. Beautiful work Darren."