In 2009, he won a gold medal at the East Asian Games as a member of the Hong Kong national under-23 football team.

Tsang was born in Hong Kong, and went to St.Patrick's Catholic Primary School in Wang Tau Hom.

[8] Tsang's performance impressed the football world of Hong Kong and he agreed a deal to sign for Kitchee in the summer of 2008.

[10][11] He was mainly used as a substitute in the 2008–09 season since captain Leung Chi Wing, Canadian Landon Ling and Cameroonian Hugues Nanmi occupied the wingback positions of two sides.

In the following season, all three wingbacks left the club but Josep Gombau, the new coach, selected centre-back Li Hang Wui for the position, leaving Tsang as a substitute for most matches.

[8][12][13][14] In the summer in 2010, Kitchee planned to loan Tsang to Tai Chung, giving him more chances to play football.

However, Tsang performed wonderfully in pre-season friendly matches and manager Ken Ng cancelled the plan.

[17][18] Because Kitchee had won the 2010–11 Hong Kong First Division League, Tsang had had a chance to participate in the 2011 Barclays Asia Trophy.

[23][24] Tsang claim his sense of striker still strongly exist and he want to prove that Hong Kong footballers can feel up to be a shooter in the team.

[28][29] In the final fixture of the league, Kitchee beat Biu Chun Rangers by 4–1 and Tsang scored in the 11th minute.

In the AFC Cup home match against Warriors, Tsang scored the fourth goal and Kitchee won by five.

[1] The association had planned him as a player of 2009 East Asian Games team originally and he was contracted to Hong Kong 08 later, formed for training youngsters for 2008 AFC Pre-Olympic Tournament.

[37] Tsang earned his first cap of under-23 football team as a defender in 2009 Hong Kong–Macau Interport on 20 June 2009, and he was age of 19.