Somerset captain Justin Langer has confirmed that he will not be returning to Taunton next season.
The 38-year-old former Australia opener's decision brings an end to a four-season stint with the county.
"I am very proud of what we have achieved as a team over the last few years," he said.
"While it is tough to let go of my playing ties with Somerset, I feel the time is now right for me to move on to the next phase in my career."
The veteran of 105 Tests has been a key factor in helping Somerset improve from County Championship Division Two also-rans (they finished bottom in 2006) to vying for the top-flight title in the past two seasons.
His last appearances for the county will come at next month's Champions League in India, for which Somerset qualified after reaching the final of this year's Twenty20 Cup.
Langer left the door ajar for a possible move elsewhere, although he admitted he may yet decide to call time on a first-class career that began with Western Australia back in 1991.
"I will take some time out to decide which route I wish to take, either within cricket or in following my other life pursuits," he added.
Langer became Australia's highest run scorer in first-class cricket earlier this summer when he surpassed 28,000 runs. He now has 86 first-class hundreds.
Somerset chief executive Richard Gould said: "JL's contribution as a player and captain will mark him down in club history as one of our most outstanding performers.
"His direction and determination has allowed the club to reinvent itself as one of the top-performing clubs in English cricket."
Somerset's director of cricket Brian Rose added: "I have been privileged over the years to have been involved with many great overseas players at Somerset, including Viv Richards, Greg Chappell and Sunil Gavaskar.
"JL is right up there with them in terms of the progression he has achieved for the club in the last three years."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.