*Club domestic league appearances and goals, correct as of 22:03, 24 November 2024 (UTC) ‡ National team caps and goals, correct as of 15:03, 23 November 2024 (UTC)
Born in Ōita, Iwata began his youth career with Oita Trinita in 2015, before signing professionally the following year, in 2016.
Yokohama F. Marinos
In 2021, Iwata signed for J1 club, Yokohama F. Marinos. On 5 November 2022, he led the club to the 2022 J1 League title. Two days later, he was named among the Best XI of the season and also voted Player of the Year.
Celtic
On 30 December 2022, Iwata signed for Scottish Premiership side Celtic on an initial loan deal with a compulsory purchase clause.[1][2] This has seen Iwata reunited with his former Yokohama manager, Ange Postecoglou. On 21 January 2023, Iwata made his debut for the club in a 5–0 win against Greenock Morton in the Scottish Cup.[3]
Celtic confirmed in July 2023 that Iwata had signed for the club on a permanent basis.[4]
Birmingham City
On 30 August 2024, Iwata signed a three-year contract with recently relegated EFL League One club Birmingham City, for an undisclosed fee.[5]
International career
On 24 May 2019, Iwata was called up by Japan's head coach Hajime Moriyasu to feature in the Copa América played in Brazil.[6] He made his debut on 20 June 2019 in the game against Uruguay, as a starter.[7]