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.

Born in Solihull, Mannion spent six years at Birmingham City prior to her north-west switch, appearing 94 times for the Blues as they reached the UEFA Champions League semi-finals in 2014 whilst finishing as runners-up in the Women's League Cup in 2016, and the FA Cup in 2017.

Beginning her career with Aston Villa, she spent two years at Manchester City between 2019 and 2021 and 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."