Career
AIK
Born to a Japanese father and a Swedish mother, he started his career with Rågsveds IF and stayed with the club until 1999 when he signed a contract with major Swedish club AIK. His league debut was not until the 2000 season against his future club IF Elfsborg. He quickly established himself as a starting lineup player and really broke through as a player against Helsingborgs IF, a 4–1 victory, scoring a goal and making 2 assists. He missed out the first game of the 2001 season due to an injury he got during the pre-season, which would continue to haunt him for the rest of the season, but he fully recovered for the 2002 season.
Prior to the 2004 season he was loaned out to Italian Serie B club Genoa over the spring part of the season, later when AIK was relegated to Superettan he signed with Norwegian club Vålerenga.
Genoa
During the winterbreak of the 2003-2004 season Genoa C.F.C. loaned Ishizaki until the end of the season. Ishizaki did not play many games for the club before returning to AIK. Genoa also had an option to buy the player, but it was never used.
Vålerenga
Instead of following AIK down into Superettan, Ishizaki decided to sign with Norwegian club Vålerenga, helping the club to break rival Rosenborg BK 13 straight league wins and bringing the title back to the club for the first time since 1984. He then left the club, signing for Allsvenska club IF Elfsborg.
Elfsborg
Stefan Ishizaki returned to Sweden prior to the 2006 season, signing for IF Elfsborg.
Being a major signing for the coming season, he helped the club to claim the league title at the end of the season. After his successful first season he remained with Elfsborg, taking a medal every season, gold (1st) in 2006, bronze (4th) in 2007, the Stora Silvret (2nd) in 2008, Lilla Silvret in 2009 (3rd) and bronze (4th) in 2010. Prior to the 2010 season he signed a new 5-year contract with the club
Los Angeles Galaxy
Stefan Ishizaki signed with the Los Angeles Galaxy in Major League Soccer before camps opened in January for the 2014 season.
Return to AIK
On 10 July 2015, it was confirmed that Ishizaki signed a 2.5 year deal with AIK. AIK
Vålerenga
IF Elfsborg
Los Angeles Galaxy.
