The Republic of Ireland international spent four years with the Reds, making 55 appearances in all competitions, having joined them from local rivals Manchester City in 2021.
During her time with Manchester United, Mannion won the first major trophy of her career coming on as a substitute in a 4-0 win against Tottenham Hotspur in the 2024 Women’s FA Cup final.
In two years with Manchester City, the defender would make 11 appearances as injury disrupted her time there. She netted once for them in the UEFA Women’s Champions League against Swiss side Lugano.
Born in Solihull, Aoife spent six years at Birmingham City prior to her north-west switch, appearing 94 times for the Blues as they reached the semi-finals of the UEFA Champions League in 2014, finished runners-up in the Women’s League Cup in 2016, and in the FA Cup in 2017. Her career started across the city with Aston Villa.
Mannion has 16 Republic of Ireland caps to her name after making her debut in 2023 against China.
On joining the Magpies, Mannion said: “It feels so good to be part of the club. I’m really looking forward to getting stuck in and trying to hit the ground running.
“It is clear to everybody the direction this club is going in, it’s really exciting to be a part of.”
Newcastle United Women Manager, Becky Langley said: “Aoife is another player who brings a wealth of WSL experience with her, and we are really pleased that she has joined Newcastle United.
“She is a defender who loves to be on the ball and will be a leader in the backline. She also has exceptional ability defending in one-v-one situations.
“Her ambitions match perfectly with ours and we are excited to work with her.”
This signing is subject to FA approval.