After almost ten years spent with Gamba Osaka between youth ranks and senior team he left the club after 60 appearances in the JLeague scoring 8 goals.

[citation needed] On 9 January 2018, Ideguchi joined Championship side Leeds United on a four-and-a-half-year deal for an undisclosed fee.

[9] By early August, Bielsa praised Ideguchi's professionalism and hard work since his joining Leeds United, but admitted he did not see him as first or second choice for any position, and indicated he did not think it would be fair to ask him to stay at the club.

[12] On 30 September, he was substituted in a 1–0 win over Dynamo Dresden with what later was revealed to be a posterior cruciate ligament injury, expected to keep him out for most of the season.

[16] On 31 December 2021, Ideguchi was announced to have signed for Scottish Premiership club Celtic for an undisclosed fee.

While Celtic won 2–1 and progressed to the next round, he sustained a serious injury and was forced off late in the game due to a strong challenge from Mouhamed Niang.

[24][25] On 9 December 2017, Ideguchi scored the winner for Japan in a 1–0 victory against North Korea in the 2017 EAFF E-1 Football Championship.