is a former

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

ese

football Football is a family of team sports that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word ''football'' normally means the form of football that is the most popular where the word is used. Sports commonly c ...

player. His younger brother

Masato Masato (written: , , , , , , , or ) is a masculine Japanese given name. Notable people with the name include: *Masato (kickboxer) (born 1979), Japanese former welterweight kickboxer, won K-1 WORLD MAX kickboxing tournament in 2003, 2008 * Masato ...

is also a former footballer.

Playing career

Koga was born in

Shizuoka Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. Shizuoka Prefecture has a population of 3,637,998 and has a geographic area of . Shizuoka Prefecture borders Kanagawa Prefecture to the east, Yamanashi Prefecture to the northea ...

on April 30, 1969. After graduating from

Juntendo University is a private university in Japan. Its headquarters are on its campus in Bunkyo, Tokyo, for the School of Medicine and in Inzai, Chiba, for the School of Health and Sports Science. The university was established in 1838 for medical and in 1946 f ...

, he joined

Japan Football League The also known as simply the JFL is the 4th tier of the Japanese association football league system, positioned beneath the three divisions of the J.League. The league features fully professional teams that hold J.League associate membership am ...

club Yamaha Motors (later ''Júbilo Iwata'') in 1992. He played many matches first season and the club won the champions in 1992 and the 2nd place in 1993. The club was promoted to

J1 League The , known as the for sponsorship reasons, is the top level of the system. Founded in 1992, it is one of the most successful leagues in Asian club football. Contested by 18 clubs, it operates on a system of promotion and relegation with the J ...

from 1994. From 1994, he became a regular player as right side back from and the club won the champions 1997 J1 League and 1998 J.League Cup. In Asia, the club also won the champions

1998–99 Asian Club Championship The 1998–99 Asian Club Championship was the 18th edition of the annual international club football competition held in the AFC region (Asia). It determined that year's club champion of association football in Asia. Júbilo Iwata of Japan won ...

. In 1999, although the club won the champions 1999 J1 League, his opportunity to play decreased behind Kiyokazu Kudo. In 2000, he moved to across town to the Júbilo rivals

Shimizu S-Pulse is a professional Japanese football club. Located in Shimizu-ku, Shizuoka, Shizuoka Prefecture, S-Pulse currently competes in the J2 League (J2). The club was formed in 1991 as a founding member of the J.League (''"Original Ten"''), which began ...

. From 2001, he became a regular player as left defender of three backs defense and the club won the champions

2001 Emperor's Cup Statistics of Emperor's Cup in the 2001 season. Overview It was contested by 80 teams, and Shimizu S-Pulse won the championship. Results 1st Round *Ohara Gakuen JaSRA 1–3 Komazawa University *Juntendo University 3–4 Sagawa Express * Sun Li ...

. In Asia, the club won the champions in 1999–00 and the 3rd place in 2000–01 Asian Cup Winners' Cup. At 3rd place match in 2000–01, he scored an opening goal. In 2003, he moved to

Cerezo Osaka is a Japanese professional football club based in Osaka. The club currently plays in the J1 League, which is the top tier of football in the country. The club's name ''Cerezo'' (Spanish for cherry blossom) is also the flower of the city of Osaka. ...

and he retired end of 2003 season.

Coaching career

After retirement, Koga started coaching career at

in 2004. In 2011, he signed with

Football Association of Singapore The Football Association of Singapore (FAS) is the governing body responsible for the administration of football in Singapore. Established in 1892 as the Singapore Football Association (SFA), it is the oldest football association in all of As ...

as the Head Coach of the National Football Academy U-17 team in Singapore. The NFA U-17 team had taken part in the

Lion City Cup The Lion City Cup, is an annual international association football Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players who primarily use their feet to propel the ball aro ...

and was also the Singapore representative that won the bronze medal at the first

Youth Olympic Games The Youth Olympic Games (YOG) is an international multi-sport event for athletes between 15 and 18 years old, organized by the International Olympic Committee. The games are held every four years in staggered summer and winter events consisten ...

Club statistics

References

External links

* 1969 births Living people Juntendo University alumni Association football people from Shizuoka Prefecture Japanese footballers J1 League players Japan Football League (1992–1998) players Júbilo Iwata players Shimizu S-Pulse players Cerezo Osaka players Association football defenders {{Japan-footy-defender-1960s-stub