|Date of birth||10 August 2001|
|Place of birth||Tokyo, Japan|
|Height||1.70 m (5 ft 7 in)|
* Senior club appearances and goals counted for the domestic league only and correct as of 19:30, 4 June 2019 (UTC)|
‡ National team caps and goals correct as of 19:30, 4 June 2019 (UTC)
After shining with Japan U-17, Koki Saito debuted on 21st July 2018, in a league match against FC Gifu. On his debut, Saito even had the chance of sharing the field with Kazuyoshi Miura, who played with despite their age difference is 34 years.
|Yokohama FC||2018||J2 League||2||0||0||0||2||0|
- "Koki Saito" (in Japanese). Yokohama FC. Retrieved 23 July 2018.
- Nippon Sports Kikaku Publishing inc./日本スポーツ企画出版社, "J1&J2&J3選手名鑑ハンディ版 2018 (NSK MOOK)", 7 February 2018, Japan, ISBN 978-4905411529 (p. 193 out of 289)
- Koki Saito at Soccerway. Retrieved 23 July 2018.
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