Endō's performances were noticed and he was quickly signed by fellow J1 League side Urawa Red Diamonds, who had finished as runners-up the previous season.

The following season, he won the 2017 Suruga Bank Championship, as well as the greatest honour in Asian football, the 2017 AFC Champions League.

[8] Endō's final appearance for Stuttgart was in a DFB-Pokal first round match against TSG Balingen on 12 August 2023, where he scored the fourth goal of a 4–0 win.

[16][17] On 27 September, he made his first full Anfield appearance and contributed to Liverpool's victory in the third round of the EFL Cup against Leicester City, assisting Dominik Szoboszlai for the deciding goal.

[21] He played the full 120 minutes of the 2024 EFL Cup final, in which Liverpool defeated Chelsea 1–0, earning Endō his first trophy with the club.

[22] On 23 July 2015, Japan's coach Vahid Halilhodžić called Endō up to the squad for the upcoming 2015 EAFF East Asian Cup.

Endō was again in the Japan squad for the 2022 FIFA World Cup in Qatar,[25] where the team reached the round of 16 before losing to Croatia on penalties.

[27][28] In January 2024, he was named for the 2023 AFC Asian Cup final squads,[29] and scored a late goal for Japan in the 2–1 loss against Iraq in their second group match.

[30] The Premier League's official website states that at Liverpool, Endo's biggest role is picking up loose balls and recycling possession efficiently.