"This year, they'll help make more dreams come true. We're thrilled to announce they'll be presenters at this year's show. #Oscars" the academy tweeted.
The announcement comes in the wake of speculation that the academy will be departing from tradition that mandates that the previous year winners present the trophies to their current year counterparts.
Janney, who won the Best Supporting Actress prize last year for her role in "I, Tonya", was upset with the news.
According to Vanity Fair, in a now-deleted Instagram post, the actor had said, "It's looking like they are not going to honour the tradition this year. It breaks my heart."
Earlier, the academy had unveiled the first list of presenters for the upcoming award ceremony.
The list included the likes of Jennifer Lopez, Awkwafina, Daniel Craig, Chris Evans, Tina Fey, Whoopi Goldberg, Brie Larson, Amy Poehler, Maya Rudolph, Amandla Stenberg, Charlize Theron, Tessa Thompson, and Constance Wu.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)