|Date of birth||15 July 1992|
|Place of birth||Setagaya, Tokyo, Japan|
|Height||1.78 m (5 ft 10 in)|
|1. FSV Mainz 05|
|2015–||1. FSV Mainz 05||38||(12)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 16:08, 7 May 2017 (UTC).
‡ National team caps and goals correct as of 16 October 2015
As a child, Muto joined FC Tokyo's youth system, where he kept developing until 2010. He then enrolled in the Faculty of Economics of Keio University but kept playing football, for Keio's team. Despite an injury which sidelined him, in his first season with Keio he won the "Rookie of the Year" title.
In 2012 and 2013, FC Tokyo included him in their roster as a "Special Designated Player", an option that allows JLeague clubs to field university players without a professional contract. However, he got on the pitch just once, at the end of a match in July 2013.
In 2014, signed his first professional contract with FC Tokyo and was given shirt number 14. Coach Massimo Ficcadenti decided to use him from the first league round and, at the end of the season, Muto reached 33 appearances netting 13 goals, matching the top debut record in the Japanese first division. At the end of the season, he was part of the JLeague's Best XI.
On 30 May 2015, Muto joined German Bundesliga club 1. FSV Mainz 05 on a four-year contract until 2019. On 31 October 2015, he scored hat-trick for the first time in his career and also became the second Japanese player after Naohiro Takahara to score a hat-trick in the Bundesliga, in his team's 3–3 draw against FC Augsburg.
Muto made his debut for Japan on 5 September 2014 in a 0–2 friendly defeat to Uruguay at the Sapporo Dome, replacing Yusuke Minagawa after 58 minutes. Four days later at Yokohama's Nissan Stadium he scored his first international goal, coming on as a halftime substitute against Venezuela and scoring the first goal of a 2–2 draw six minutes later.
- As of 12 August 2017
|F.C. Tokyo||2013||J1 League||1||0||0||0||0||0||0||0||1||0|
|1. FSV Mainz 05||2015–16||Bundesliga||20||7||1||0||0||0||0||0||21||7|
- "【ソッカー男子】開幕前取材、第3弾 武藤嘉紀編" (in Japanese).
- "武藤嘉紀選手（慶應義塾大学）「ＪＦＡ・Ｊリーグ特別指定選手」承認のお知らせ" (in Japanese).
- "武藤嘉紀選手(慶應義塾大学)来季新加入内定のお知らせ" (in Japanese).
- "Chelsea scout out Muto". Marca.
- Dan Orlowitz. "Yasuhito Endo awarded 2014 J-League MVP; FC Tokyo and Gamba Osaka spearhead Best XI". Football Channel Asia.
- "Yoshinori Muto: Chelsea make bid for Japanese striker". BBC Sport. 9 April 2015. Retrieved 9 April 2015.
- "Muto named Coca-Cola MVP winners in March". JLeague Sport. 11 April 2015. Archived from the original on April 19, 2015. Retrieved 11 April 2015.
- "Mainz 05 sign Yoshinori Muto". Mainz 05. 30 May 2015. Retrieved 30 May 2015.
- "Muto hits hat-trick in Mainz draw". The Japan Times. Retrieved 3 November 2015.
- "Japan 0–2 Uruguay: Cavani on target for Celeste". Goal.com. 5 September 2014. Retrieved 9 April 2015.
- West, Harry (9 September 2014). "Japan 2–2 Venezuela: Kawashima mistake costs Aguirre maiden win". Goal.com. Retrieved 10 April 2015.
- "Asian Cup 2015: UAE complete shock win over Japan to reach semi-final after penalty shootout dramatics". Australian Broadcasting Corporation. 23 January 2015. Retrieved 9 April 2015.
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