Star apprentice Matthew Chadwick's availability for tomorrow's Sha Tin meeting was still in the balance last night, with Jockey Club officials awaiting a final report on his condition.
Chadwick was rushed to Queen Mary Hospital on Thursday night after his mount, Nilometer, clipped heels at the 400m mark at Happy Valley and dislodged the apprentice.
All initial reports suggested Chadwick was unhurt and would remain in hospital for observation only until yesterday morning. However, a brief release from the stewards just before 5pm yesterday said the top junior had been 'undergoing continued observation' and his fitness to ride tomorrow had yet to be advised.
Chadwick's rise this season has been nothing short of meteoric, beginning his Hong Kong career in December and climbing into the top six on the roster in just six months.
But he will not be cleared for Sha Tin until a specialist has advised the club, in writing, that the teenager is not injured and was not concussed in the incident.
If the specialist determines that Chadwick did suffer concussion in the fall, under the rules, that would require a mandatory five-day standing down.
Weichong Marwing stood down from his remaining mounts on Thursday night after completing race three, complaining of a congested chest.
Marwing was also in the hands of a specialist yesterday to assess his fitness to ride at Sha Tin.
The stewards advised that following a visit to the Club's doctors, he has been referred to a specialist for further examination.
This examination is scheduled to occur at noon today.
Substitute riders were declared yesterday morning for both jockeys.