Tatsuomi Koishi

Tatsuomi Koishi (小石 龍臣) is a former Japanese football player.

Playing career
Koishi was born in Tosu on August 22, 1977. After graduating from Rissho University, he joined the J2 League club Sagan Tosu based in his local area in 2000. He played often as a forward during his first season. In 2003, he played as an offensive midfielder. However he was not played in 2005. In 2006, he moved to the Japan Football League club ALO's Hokuriku. He retired at the end of the 2006 season.