AceShowbiz -

With Aaron Johnson seemingly up for portraying Quicksilver in "Avengers: Age of Ultron", the only assignment director Joss Whedon needs to work on now is to find the best actress to play the speedy hero's sister, Scarlet Witch. "Hanna" star Saoirse Ronan has been linked to the said role, but a new report reveals it won't be her after all.

Bleeding Cool reports that Irish actress Ronan, who was said to be Whedon's top choice, has apparently passed on the coveted role despite the fact that she once said she would love to portray the character, also known as Wanda Maximoff. Following this, Whedon and Marvel reportedly move their attentions to Elizabeth Olsen.

Having been praised by critics for her acting in "Martha Marcy May Marlene" and "Liberal Arts", Olsen is certainly a nice pick. The requirement to adopt a "European" accent for the role might not be quite a struggle for the young talented actress, who will next be seen in "Oldboy" and "Godzilla".

The report additionally provides info on Whedon's version of Scarlet Witch. The hotly-anticipated sequel might not tie her character's backstory into that of Magneto, her father in the comic books.

Robert Downey Jr. will return as Iron Man in "Avengers 2", due out May 2015.