The 20-year-old is the Reds' first addition of the summer.
Maclean told Liverpoolfc.com: “I’m really looking forward to it. I’m really excited to get going in pre-season and to meet all the girls, and hopefully we can start the season well.
“I think the club speaks for itself. It’s obviously a massive club with a lot of history and to be able to represent the badge is a really proud moment for me.
“I was at Rangers for 11 years and I loved my time there, but I felt like it was the right time for a new challenge and to take the next step into the WSL, so I’m really looking forward to it.
“I’m a midfielder who likes to be on the ball and tries to make things happen so hopefully I can link up with the players in front of me and we can try to score lots of goals this season.”
