Career
He is primarily a central midfielder but can also play at full-back. Koizumi started his career as a junior player with Yokohama F. Marinos, but the club did not promote him to their Under-18 team He entered Ryutsu Keizai University Kashiwa High School and started playing for the school.
In 2014, Koizumi joined J. League Division 1 club Albirex Niigata and has added some versatility to the Albirex squad.
His ability to play in a number of positions across defence and midfield made him an attractive proposition and boss Masaaki Yanagishita was delighted to be able to prise him away from The Big Swan Stadium.
