is a former Japanese football player and manager. Playing career Koso was born in Saga on March 6, 1959. After graduating from Tenri University, he joined Matsushita Electric (later Gamba Osaka) in 1981. He retired in 1991. Coaching career In 1990, when Koso was a player, he became goalkeeper coach at Matsushita Electric. He coached until 1997. In 2000, he signed as manager with his local club Sagan Tosu and became a manager. He managed until 2001. Managerial statistics References External links 1959 births Living people Tenri University alumni Association football people from Saga Prefecture Japanese footballers Japan Soccer League players Gamba Osaka players Japanese football managers J2 League managers Sagan Tosu managers Association football goalkeepers