is a former Japanese football player. His younger brother Seiji is also a footballer.
Club career Koga was born in Okawa on September 8, 1978. After graduating from high school, he joined the Nagoya Grampus Eight in 1997. He became a regular player as a center back from 1998. The club won the 1999 Emperor's Cup. He moved to Kashiwa Reysol in 2007. Although he played as a regular player, he lost his place due to an injury in 2010. He then moved to Júbilo Iwata in August 2010. After playing for two seasons, he moved to his local club Avispa Fukuoka in 2012. He retired at the end of the 2015 season.
National team career In August 1995, Koga was selected by the Japan U-17 national team for the 1995 U-17 World Championship and he played full time in all three matches. In June 1997, he was also selected by the Japan U-20 national team for the 1997 World Youth Championship, but he did not play in any matches.
Club statistics Club performance League Cup League Cup Total Season Club League Apps Goals Apps Goals Apps Goals Apps GoalsJapan League Emperor's Cup J.League Cup Total1997Nagoya Grampus EightJ1 League8010501401998210000021019992625040352200025210403022001180003021020022813060371200328220403422004241217033220052751060345200626200503122007Kashiwa ReysolJ1 League292102132320082915151393200920200402422010J2 League000000002010Júbilo IwataJ1 League120203017020117010201002012Avispa FukuokaJ2 League33120--3512013220000022020141301000140201560000060Total4022127260248925
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