Happy Valley Both Sham Kwok Keung and his older brother
Sham Kwok Fai were youth products of
Happy Valley. He was named the Best Young Player in the
2003-04 season. But since then his progress has been hampered by injuries. At the end of the 2005–06 season he underwent surgery for his knee and spent 3 months recuperating. He regained a starting position but then twisted his ankle and broke half of his tendon, ending his season. The injuries caused him to change his shirt number from 12 to 13.
Shatin Sham Kwok Keung joined
Shatin in the
2009-10 season, after Happy Valley was relegated. He scored a goal in the 7th minute against
Tai Po to help the team win its first game by 4–1 on 24 October 2009. Shatin SA was relegated at the end of the season. Sham Kwok Keung thus moved to
Citizen to replace
Xu Deshuai who moved to
South China.
Citizen Sham scored the second goal with a header, from brother
Sham Kwok Fai's cross, for Citizen and helped the team overcome a 0–3 deficit in the
2010-11 Hong Kong Senior Challenge Shield final against South China, to eventually tie the match 3–3. Citizen went on to win the penalty shoot-out by 4–2 to win the trophy and qualified for the
2012 AFC Cup. In the league, on 19 December 2010, Sham Kwok Keung scored against Kitchee to earn a 1–1 draw for Citizen. In April 2011, he scored the only goal in Citizen's 1–0 win over
Tai Chung FC. In all he scored 6 goals for Citizen in the 2010–11 league season. On 17 November 2011, he was diagnosed with a broken rib, sustained in the match in October against
Tuen Mun when he was hit in the chest, and had to rest for 3 weeks. He did not therefore play against league champions
Kitchee on 20 November 2011. On 6 January 2012, Sham Kwok Keung scored a header in the 85th minute against South China to make it 3–2 to Citizen, but later he was sent off for two bookable offences. The matched ended 3–3. ==International career==