Rachel Newborough has joined Barclays Women's Championship side Coventry United on a permanent deal.
The 26-year-old defender signed for Charlton in the summer of 2019 and was the Addicks' vice-captain for the 2021/22 season.
Head Coach Karen Hills said: "I want to take this opportunity to thank Rachel for her hard work and exemplary professionalism during her Charlton career. She has always supported her teammates on and off the pitch and I am really glad to see her make her return to the field since her ACL injury.
"Everyone at the club wishes her all the best with her new club Coventry United, and I have no doubt that she will make an impact."
Newborough was one of the first Charlton players to sign a fully professional contract with the club in the summer of 2021.
The full-back ruptured her ACL at the start of 2022, forcing her to spend a lengthy spell on the sidelines. She returned from injury last November, appearing in Charlton's win over Bristol City in the Continental Cup group stages.
Speaking following the move, she said: "Charlton has been my home for the past four years and will always be a special place to me. I've been fortunate enough to see the club grow from part-time to full time and I'm very proud of the part I've played in getting the club to where it is now.
"Karen and the team have been amazing in supporting me the whole way through my ACL rehab."
The club would like to thank Rachel for all her efforts during her time with Charlton and wish her all the best in her future career.