Staniforth has made 16 senior appearances for the England women’s national team and was part of the squad for the recent 2019 FIFA Women’s World Cup and 2020 SheBelieves Cup.
Lucy Staniforth said: “I’m really happy to have signed with Manchester United; it’s the biggest club in the world and I’m so proud to be part of it. I’ve been impressed with the performances from last season and the club’s future ambitions. I wanted to come here to win trophies and make history with this club, and I’m just excited to get started.”
Casey Stoney said: “I’m thrilled to have Lucy join United; she is a fantastic player who will add great depth to the strong midfield department we have built at the club.