Tsang Wai-chung yesterday stepped down as South China head coach, three months after he accepted the challenge with the defending champions. Tsang (pictured) quit the Hong Kong Football Association as technical executive to join the Caroliners. He succeeded Portuguese Jose Luis, who steered South China to two major titles last season. But having been in charge for only one match - a disappointing 1-1 draw with unfancied Citizen - Tsang quit the job for 'health reasons'. 'I have found myself awake at night with some abnormal heart beats,' he said yesterday. 'I suffered similar symptoms when I last coached Sing Tao in the '90s and had to take medicine for three years. I think it would be better for me to quit the job. 'I know it has something to do with the pressure of coaching a club like South China, but I knew it before I decided to take up the offer. By choosing to leave the job at this stage a newcomer has plenty of time to make changes.' Assistant coach Liu Chun-fai has been appointed the interim coach for their second match against Tuen Mun Progoal on Saturday. South China team convenor Steven Lo Kit-sing said Tsang's decision caught him by surprise. 'It all came very suddenly,' said Lo. 'But after knowing his health condition, I think this is the right decision. 'I want to thank him sincerely for his hard work and effort over the past couple of months. We are very sorry he has to leave us.' Lo voiced his disappointment after South China's opening draw, but said Tsang's decision had nothing to do with the match. Liu, who won the best coach award last season while with Citizen, said he would keep changes to a minimum. 'Our primary target is our match against Progoal,' said the former Hong Kong goalkeeper. 'After that, I will discuss any long-term planning issues with the management. It is going to be a big challenge for me, but since I have decided to work in the coaching field, the challenge will come either now or later.' Captain Chan Wai-ho admitted the departure of Tsang, who will stay on as an adviser, would cause some unrest among the players. 'The team was getting better in terms of understanding, but now he's gone,' said the defender. 'We hope the unsettled period will pass soon and we can focus again on our matches.'