After impressive performances with the New Zealand national under-20 football team at the 2019 FIFA U-20 World Cup, Singh signed a three-year deal with Bayern Munich.

Born in Auckland, New Zealand, Singh grew up playing for local club Onehunga Sports under the tutelage of long-term mentor Hiroshi Miyazawa.

[2][3][4] At the age of ten, Singh represented Auckland at the Australian National Futsal Championships, winning the most valuable player award and attracting interest from Premier League side Everton.

[3] Singh joined the Wellington Phoenix Academy in early 2015 after impressing then-Phoenix coach Ernie Merrick, while playing for the New Zealand under-17 side at the OFC U-17 Championship.

[8] Singh gained a consistent role in the Wellington Phoenix first team midway through the 2017–18 A-League season, making a series of substitute appearances under Darije Kalezić.

[9][11] Singh carried his form into the 2018–19 season, becoming an undisputed starter under new coach Marko Rudan playing 26 games, scoring five goals and registering a team-high eight assists.

[12] Following a breakout performance in a 4–1 win over Brisbane Roar on 22 December 2018, in which Singh scored from a free kick and assisted a David Williams goal, he was described by critic Mark Bosnich as "the best player in the A-League right now at this moment in time".

[16] Singh made his friendly debut for the reserve side on 6 July 2019, assisting the opening goal as Bayern Munich II overcame FC Liefering 2–1.

[17] Singh made an appearance for the senior team eleven days later, playing the second half in a 2–1 friendly defeat to Arsenal in the 2019 International Champions Cup, and again in the other two tournament games against Real Madrid and AC Milan.

[18][19] Singh started his first game for Bayern Munich on 31 July, playing the full match and scoring in a penalty shoot-out loss to Tottenham Hotspur in the 2019 Audi Cup final.

[20] Singh's performance in the pre-season impressed Bayern Munich's coach Niko Kovač; on 3 August, he was called up for a 2–0 loss against Borussia Dortmund in the DFL Supercup, but was an unused substitute.

With a nimble gait and quick turn of pace, alongside exceptional vision and creativity for his age, Singh has earned comparisons to German attacking midfielder Mesut Özil.