Rachel joined the club at 18 years old and quickly established herself as a formidable figure in the centre of defence.
Just three years later, when club captain Laura Montgomery retired, Rachel was chosen to lead the Scottish champions.
In her career with Glasgow City, Rachel has won six premier league titles, four Scottish cups, four premier league cups, and has started 20 games in Europe.
City head coach Eddie Wolecki Black said: I knew Rachel had thoughts of moving away from Scotland as she told me at the end of last season. A very honest thing to do but I wouldn’t expect anything less of my captain.
“As manager and captain together we have many great memories to share. I was at her first training session, saw her make her debut, moved her to centre half, saw her win her first trophy, then her first title and her first cap.
“I also saw her lying on a pitch in Madrid in agony when she tore her ACL playing for Scotland.
“She was inconsolable when we lost in the Champions League in Denmark in 2012, she took the defeats so personally. Happily she bounced back and led the team to more success.
“I speak for everyone at the club in wishing Rachel a happy, successful and injury free career.”
Rachel added: ““Having joined in 2008, I now leave the club with great memories and some unforgettable experiences.
“I would of course like to especially thank Laura and CAS for the opportunity to be a part of this incredible club. Their desire and relenting ambition to continue to grow and develop Glasgow City has been inspirational and it has been an honour to be a part of.
“I leave a far greater player than when I arrived and I am indebted to both Eddie, the coaching team and also of course all my team mates (past and present) who have been influential to my growth and development.
“ Not only has City allowed me to win domestic medals and experience European football but it has also been fundamental to my inclusion in the National Team, a lifelong dream.
“I will always remain a City fan and will continue to follow and support the team through the years to come. I know that they have many successes ahead of them and even as I leave to take on a new venture in my career I am excited to follow the triumphs to come.”