Aaron Mooy has quit St Mirren ahead of a return to his native Australia.
The Paisley club received the midfielder's signed release papers on Wednesday morning and expect him to sign for A-League side West Sydney FC.
The 21-year-old joined Saints in October 2010 after compensation was agreed with Bolton and made 30 appearances for the Buddies.
St Mirren general manager Brian Caldwell told the club's website: "This move will give Aaron the opportunity to play more first team football which he really needs at this stage of his career.
"He has been in the UK for the last six years so I'm sure he will be glad to get back home to Australia where he will look to push on with his career.
"We would like to thank Aaron for his efforts while here at St Mirren and to wish him all the best for the future."