Three days after his returned, he was contacted by R&F coach Leung Chi Wing who offered him a chance to play professional football at a RMB$6,000 per month salary.

Lam was handed his first team debut 18 September 2016 in a Senior Shield match versus Hong Kong Sapling and at age 16, became the youngest player to appear in the competition.

[11] On 16 November 2023, Lam made his international debut for Hong Kong in the World Cup qualifiers against Iran.

[15] On 10 September 2022, videos began circulating on the internet of Lam tossing his kit at a referee after being sent off in a local futsal match.

Rangers responded by suspending Lam indefinitely for his actions and for participating in football activity without permission from the club.