Fellowes has recently been commissioned to write a new Us drama called The Gilded Age.
He said that he cannot do both shows at the same time and that the new project will not begin until Downton Abbey has ended.
Speaking about The Gilded Age, Fellowes told The Wall Street Journal: "It's for NBC Universal and it will happen when Downton finishes because I just couldn't do both at once.
"I haven't written it yet, but it's about the old aristocracy, the Winthrops and the Stuyvesants and the new money of oil and gas and shipping in the 1870s. It will all be fiction - it won't be real people - but when those families descended on New York, they took over."
Downton Abbey has been commissioned for a fifth series by »
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