Gerbig has played for Hong Kong U-20, Royal Blues and Taipei Red Lions in the Taiwan Football Premier League.

[5][6] In the second year, he helped the team win the 2019 Sun Belt Conference and qualified for the NCAA Division I Men's Soccer Tournament.

[8] Gerbig made his professional debut in the AFC Champions League Round of 16 match against BG Pathum United on 19 August 2022.

After impressive performances during the 2023 AFC Asian Cup group stage matches, Gerbig attracted interest from Chinese clubs.

On 29 February 2024, Gerbig joined Chinese Super League club Henan for a transfer fee of RMB $1 million.

[14] In March 2019, Gerbig was called up again in the 2020 AFC U23 Championship qualifiers and played for the first time against North Korea U-23, where Hong Kong U-23 lost by two goals in the final match.

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