There was good news and bad news for Hong Kong as they began their campaign in the East Asian Championship in Taipei yesterday. Hong Kong thrashed minnows Mongolia 6-0 to get their campaign off to a flying start. But victory was costly as the SAR have been left with just 14 players for their second game against Guam tomorrow after striker Au Wai-lun became the latest to join the casualty list. Already forced to make do without eight Happy Valley players, who are involved in next week's AFC Cup in Maldives, coach Lai Sun-cheung was not a happy man despite his team's crushing victory at the Chung San Stadium. 'If we get any more injuries, we are going to be in serious trouble,' said Lai. 'Right now, we got 14 players so everybody will get to play [tomorrow],' he said. The Happy Valley players will rejoin the national squad after travelling to the Maldives to take on New Radient on Wednesday. Au limped off the pitch at the end of the first half with Hong Kong leading 1-0 thanks to a 30th-minute penalty converted by Chu Siu-ki. Law Chun-bong gave his side a two-goal cushion two minutes after the break as Hong Kong began to tear Mongolia's defence apart with some decent play. Wong Chun-yue hammered in Hong Kong's third goal before Lam Ka-wai made it 4-0 in the 78th minute. Forward Chan Yiu-lun, who replaced the injured Au, then scored two late goals to complete the 6-0 victory. Hong Kong destroyed Mongolia 10-0 in this competition here two years ago, but Lai said he was not completely satisfied with his side's performance this time around. 'We had loads of chances but we couldn't put them away. We only led in the first half through a penalty. Mongolia are one of the weakest teams in the competition and we should have pulverised them. 'I'm a bit worried about Au Wai-lun because he is almost certain to miss our next match. 'He is one of the most experienced players around. We're in for a big test against Guam with the squad we have left now,' said Lai. Hosts Taiwan started their campaign brightly by hammering Guam 9-0 yesterday. Hong Kong will play Taiwan on Friday, but the SAR will regroup in strength with all eight of their Happy Valley players returning to the side for the crunch match.