HONG Kong Footballer of the Year Ricky Cheng Siu-chung and Sing Tao left-winger Chan Tsz-kong are the territory's secret weapons in today's World Cup qualifying match against Thailand. Cheng and Chan, both 24, were dropped from the territory's first Asian Group Six qualifier against South Korea last month because they lacked fitness. Now they are fit again and will replace Chiu Chung-man and Lo Kai-wah. 'All our 21 players are in good condition. We will field our strongest side and we are looking for a win,' said national coach Kwok Ka-ming. 'The Thais have reviewed the video of our game against the Koreans. Since Cheng and Chan did not play in that game, the Thais would not have any idea of how they play. 'Apart from those two changes, I've retained all the other players from our game against South Korea.' Kwok said his players were under pressure after their excellent performance against the Koreans, even though they eventually lost 2-0. 'It's lucky that we are playing in Bangkok, not Hong Kong, where the pressure would be greater,' he said. The Thais, meanwhile, are struggling with injuries and a number of their players have been disciplined for lacking commitment. Star left-back Dusit Chalermsan, known as the 'bad boy' of Thai soccer, is likely to be left on the bench after he missed four days' training. Dusit was also fined 8,000 baht (HK$2,600) by head coach Chanvit Polchivin. Forward Natipong Sritong-In was earlier fined by the Football Association of Thailand after failing to show up at the King's Cup award ceremony last month. And veteran forward Piyapong Pue-on could miss the game because of a knee injury. Three other players - defenders Surachai Jirasirichote and Chakarat Thonghongsa, and play-maker Surachai Jaturapattarapong - are also doubtful because of injuries.