Koki Ishii is a 31-year-old professional football player from JPN. He currently plays for AC Nagano Parceiro, wearing the number 16 shirt. He plays primarily as a Defender. He stands at 172cm tall and weighs 67kg.

Throughout the J2/J3 100 Year Vision League 2026, Koki Ishii featured in 3 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.