Megan Campbell has become the second Republic of Ireland international inside a week to join Liverpool.
The left-back has spent the past five seasons at Manchester City.
Campbell will link up with fellow Ireland internationals Niamh Fahey and Leanne Kiernan.
"Meg offers a bit of versatility as she can play centre-back or left-back," said Liverpool FC Women boss, Matt Beard.
"Obviously her long throw is well-documented in the game and with players like Furney [Rachel Furness] in our team, it will be a good weapon for us.
"She's a fantastic footballer who's been a bit unlucky with injuries over the last year or so, and I think it just fits for us and it fits for her.
"It's another player who knows how to win things and has been involved in a club that is challenging. Her experience is going to be very valuable for us this campaign."
Campbell says Beard's influence was key to her swapping City for the Championship club, "Matt has been great for me and when he contacted me and said he wanted to bring me here, that was brilliant for me - hearing a manager wanted me so badly.
"So when I got the opportunity, I was never going to turn it down.
"I'm really looking forward to this challenge. The manager has put his trust and faith in me.
"I know I've had injuries in the past but I'm just looking forward to getting back on the grass and working hard for him. So, fingers crossed it goes well."
Campbell says promotion to the WSL is their primary objective this season.
"I know the girls, from seeing a few interviews and stuff, were quite disappointed not getting promoted last year," she said, "And I know they will have fire in their bellies and are ready to push on now.
"Obviously Matt has come in as well and he's very experienced.
"He's been here before, won two titles and he knows what it takes as well. I'm really looking forward to getting in and around the group and pushing on now."