The Hong Kong Jockey Club inquiry into the serious fall suffered by work rider Chan Kwok-leung will enter a third day at Happy Valley this morning. The hearing had been expected to reach a conclusion yesterday, but it was adjourned for a second time after veteran trainer Alex Wong Siu-tan, who has been charged with a breach of Jockey Club rules over the incident involving his horse The Young Treasure, asked for Australian jockey Craig Williams to give evidence. Williams was unavailable yesterday as he was returning from Australia, where he rode at the weekend, but his evidence will be heard when the inquiry reconvenes at 11.30am today. Williams rode The Young Treasure on its racecourse debut in December, before French jockey Davy Bonilla took over on the gelding's only subsequent outing. Wong left yesterday's 3.25-hour hearing without comment, but Winfried Engelbrecht-Bresges, the Club's director of racing, said it was vital for the inquiry to look at all aspects of the case. 'This is a very serious and difficult case and there is a lot of evidence to consider. Following the evidence that was given today, Mr Wong Siu-tan wanted the opportunity to call a further witness, or witnesses, and it is only fair and proper that we should entertain his request.' The inquiry follows Chan's trackwork fall from The Young Treasure almost three weeks ago in which the 25-year-old was seriously injured. The work rider, who has been allocated to Wong since August 1997, remains in a stable but critical condition. The inquiry, which opened on February 9 with a 3.25-hour hearing that heard evidence from 18 witnesses, doubled its time span yesterday with another marathon session. It was attended by Chan's brother Chan Kwok-kin and sister Chan Mei-ying. Wong, who pleaded not guilty to the charges, offered written submissions which had been prepared on his behalf by leading counsel Kevin Egan, and the inquiry also received a written submission from the Racehorse Trainers' Association. As well as Wong, a number of other witnesses gave evidence for a second time, including Wong's assistant trainers Michael Chang Chun-wai and Ricky Chow Chung-keung, John Ridley, the Club's racing manager (clerk of the course), expatriate work rider Fergus Gallagher and outrider Cheng Sun-on. Evidence was also heard from internationally renowned neuro-surgeon Dr W. S. Poon, who has been closely involved in Chan's treatment. Poon heads the neurosurgery division at the Prince of Wales Hospital in Sha Tin, where Chan was taken following his fall, and is a professor of neurosurgery at the Chinese University of Hong Kong. Poon's evidence is believed to have centred on the issue of Chan's equipment as well as the nature of his injuries. The charges against Wong come under Rule 58, which relates to a trainer's responsibilities. He is charged with a breach of Rule 58 (i) (a), which states: 'Each trainer shall conduct his business properly with due regard to the interest of his owners and is responsible for the good management and training of horses in his charge.' And/or a breach of Rule 58 (ii) (b), which states: 'Each trainer shall be responsible for all matters pertaining to the running of his stable including stable routine, feeding, security inside the stable and the work of his stable staff allocated to him.'