The Hong Kong Football Association is calling for an independent investigation into match-fixing allegations in a First Division soccer team after a player accused his mainland teammates of deliberately throwing a game. Tuen Mun Progoal were leading 1-0 at half-time, but conceded five goals in the second period - four in the last seven minutes - as Valley went on to win Tuesday's league match 5-1. The semi-professional player, midfielder Cheung Tin-tak, dropped the bombshell on his blog on Wednesday, writing: 'I have had enough and will not play for Tuen Mun any more. Conceding four goals in seven minutes was not because Valley were a strong team, but because our four mainland players did not try their best ... it was not the first time that we looked like a different team in the second half after having played well in the first period ... I think we all know it is because of $$$$$$$$$$$.' The 29-year-old midfielder, a secondary school teacher by day, has played 16 matches this season and scored three goals. 'I will leave it to the club's decision on whether I leave or stay on the team,' Cheung said yesterday. Betting on Hong Kong soccer is available on some mainland websites. For the game between these two teams, the odds were for Valley to win by more than three goals. ICAC commissioner Timothy Tong Hin-ming said yesterday the anti-graft agency did not comment on individual cases, but it was responsible for investigating any alleged corruption. Ken Ng Kin, director of the Hong Kong Football Association, proposed an independent investigation conducted by a credible panel including professionals outside the sport. 'It needs to find out the truth and give the involved football players justice as this allegation gives rise to widespread concern from the public,' Mr Ng said. Tuen Mun Progoal boss Yam Wai-hung said yesterday he would look into the matter. 'A player always gets very emotional after losing a match,' Mr Yam, a former Hong Kong goalkeeper, said. 'Cheung is a good player with a strong desire to win, but if he has decided to leave the club, there is nothing I can do about it.' On Cheung's match-fixing allegations, Mr Yam said: 'This is a very serious accusation. If anyone has evidence of match-fixing, he should report it to the authorities.' South China team convenor Steven Lo Kit-sing urged the association to look into the case. 'The association should investigate the matter.' Four Hong Kong players were jailed after being found guilty of a match-fixing charge relating to Hong Kong's World Cup qualifier against Thailand in March 1997. Winger Chan Tsz-kong was sentenced to one year in jail, while goalkeeper Kevin Lok Kar-win, defender Chan Chi-keung and striker Wai Kwan-lung were jailed for 22 months. Chan Tsz-kong was found to have pocketed HK$80,000, while the others had received HK$30,000 each for their part in throwing the match.