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Dafoe confirmed the news to Total Film, telling the site that production has already started on the highly-anticipated follow-up.
"It's even better than the first," Dafoe said. "It's fantastic."
"Finding Dory" picks up about a year after "Nemo" left off, and centers on Ellen DeGeneres's character's quest to reunite with her long-lost family. While Dafoe wouldn't reveal anything else about the film's plot, he was confident that it would follow a trajectory similar to its predecessor.
"It's difficult to repeat a success and so many years afterwards, but it's really cool," Dafoe said. "I've done one session so far and I just am going to have such a good time."
"Finding Dory" will swim into theaters on June 17, 2016.
[via Total Film]