Interestingly, Andrews will play a key role in "Aquaman," the DC Films and Warner Bros. franchise contender led by Jason Momoa.
The star of "Sound of Music" will make the voice of Karathen, a mythical sea creature that helps the peace of the hero of Momoa to promote peace between Atlantis and the dry land, said a person familiar with the project. Variety.
"Aquaman" begins on December 21, two days before the release of "Mary Poppins Returns", when Blunt will assume a role originated by Andrews in the 1964 Disney classic (for which he won the Best Actress Oscar).
The news was first report by Entertainment Weekly.
"We wanted Karathen to have the voice of a classic British actress, albeit somewhat digitally altered," Peter Safran, producer of "Aquaman," told the magazine.
"And when we realized that Julie was interested, available and willing to do it, it was very easy to choose her," she said.
Andrews has consistently done voice work in recent years, in series of blockbusters such as "Shrek" and "Despicable Me". He has not appeared on the screen since the 2010 family comedy "Tooth Fairy" with Dwayne Johnson.
Andrews is represented by WME and the management company Media Four.