Late this afternoon the Stewards were advised by Dr E N M Ho, the Club's Acting Head of Racing Laboratory, that a pre-race urine sample taken from a horse declared to run in tonight's racemeeting was found to contain the prohibited substance diclofenac. It was subsequently established that the pre-race urine sample was taken from VICTORIUS trained by Mr Y S Tsui. The Stewards acceded to a request from Mr Tsui to withdraw VICTORIUS from this race. Accordingly, VICTORIUS was withdrawn by order of the Stewards. The Stewards ordered for a further urine sample to be taken from VICTORIUS under post-race conditions. The matter was adjourned until a date to be fixed.