'Sopranos' to end after sixth season
Twelve new episodes will air in the US from March, followed by eight bonus episodes in January 2007.
Speaking at a press event, Chase revealed, "There will be these 12 [forthcoming episodes] and then another eight, and that will be the end."
He also warned that a feature-length movie version of the show is now unlikely.
"We haven't talked about it in a long time. It's hard to see how it would work," Chase explained. "I think what we're going to be doing the next year and a half would have been that movie."
The show's star James Gandolfini added that he is ready to move on to new projects.
"I'm too tired to be a tough guy or any of that stuff anymore," he said. "We pretty much used all that up in this show."