New Zealand captain Ali Riley has left Chelsea Women after a single season to join Bayern Munich.
The 31-year-old wing-back arrived from Swedish club Rosengard last summer but suffered a foot injury in pre-season.
She was restricted to 17 appearances last term, seven of them starts.
“For a player her age, it’s absolutely vital she’s playing week in, week out. We couldn’t guarantee that with the squad numbers we have,” said Chelsea manager Emma Hayes.
Chelsea begin the new season with a home derby against Tottenham Women on Sunday, 8 September.
Find all the latest football transfers on our dedicated page.
BBC Sport has launched #ChangeTheGame this summer to showcase female athletes in a way they never have been before. Through more live women’s sport available to watch across the BBC this summer, complemented by our journalism, we are aiming to turn up the volume on women’s sport and alter perceptions. Find out more here.