On July 1, at the halfway point of the J-League season, the 39-year-old will take the field for the final time for the team.
Iniesta, who has only played as a substitute three times so far this season for league-leading Vissel, has no immediate plans to retire.
I want to properly wrap up my time here, and then I'll look at my options," he said.
"I intend to continue competing before retiring while still in the game. I want to find a place where I can eventually retire because I can't do that here.
Iniesta joined Vissel in 2018, and since then, he has made 133 appearances for the team, winning both the Japanese Super Cup and the domestic Emperor's Cup.
That came after a 22-year career at Barcelona, where he made 674 appearances as a senior and won 32 trophies.