The 23-year-old goalkeeper has been at Kolbotn IL since 2016 and captains the Norwegian national team at Under-23 level.
Aurora Mikalsen said:
“I’m really happy to be here; to come to United has been a dream for me since I was a child. I’m looking forward to meeting the group and developing myself as a player under Casey and the coaching staff. It’s an exciting time to be at this club and I can’t wait to get started.”
Casey Stoney said:
“Aurora is a fantastic young talent with a lot of potential and we are pleased to have her with us for this new season.