Manchester City captain Vincent Kompany will leave the club this summer, after securing an historic domestic Treble, to become player-manager of Belgian club Anderlecht.

Kompany, 33, is City’s longest-serving player, having joined in August 2008, but his contract runs out at the end of the season – and though ESPN FC had been told that there was a willingness from both the club and the player to agree a new deal, he revealed he would be leaving after City’s FA Cup final win over Watford.

Kompany has been blighted with injury problems in recent years but started five of City’s last six Premier League matches to help them win the title, including scoring a stunning winner against Leicester in the penultimate game.

“As overwhelming as it is, the time has come for me to go,” he said in a post on Facebook. “And what a season to bow out. I feel nothing but gratefulness. I am grateful to all those who supported me on a special journey, at a very special club. I remember the first day, as clear as I see the last. I remember the boundless kindness I received from the people of Manchester.

“I will never forget how all Man City supporters remained loyal to me in good times and especially bad times. Against the odds you have always backed me and inspired me to never give up.

“Sheikh Mansour changed my life and that of all the City fans around the world, for that I am forever grateful. A blue nation has arisen and challenged the established order of things, I find that awesome.

“I cherish the counsel and leadership of a good human being, Khaldoon Al Mubarak. Man City could not be in better hands.”

In a second post later on Sunday, Kompany revealed his next move, “For the next three years, I will take up the role of Player-Manager of RSC Anderlecht … I have decided to take up the challenge at RSC Anderlecht. Player-Manager. I want to share my knowledge with the next purple generations. With that, I will also put a bit of Manchester in the heart of Belgium.”