Howard Johnson's disciplinary hearing in London was adjourned without conclusion on Thursday evening.
An additional day - in August at the earliest - is required to hear outstanding evidence, with a date due to be confirmed within the next few days.
Paul Struthers, head of communications for the British Horseracing Authority, said: "Unfortunately the (disciplinary) panel were unable to hear all of the evidence in the time available."
He added: "There were unforeseen issues arising in respect of a witness before proceedings began yesterday, and whilst both sides were confident that the hearing would still conclude in time, some of the other evidence presented and witness examinations took longer than anticipated.
"There is a possibility that the hearing could reconvene in early August but if not the next available date that all parties can attend is early September. We will confirm the date once all parties have agreed on it."
Johnson could be fighting for his training career after admitting to running a horse that had undergone a palmar neurectomy under his care. The neurectomy to the horse's left-fore leg came to light following a post-mortem carried out on Striking Article after the horse was pulled up and euthanised at Musselburgh on February 7, 2010.
The procedure involves severing nervous connection to the lower leg to cause numbness. It is banned under the Rules of Racing on welfare grounds. Striking Article underwent the procedure in April 2008 yet ran eight times afterwards. Johnson claims he was unaware of the rule that states he should not have run the horse.
Johnson has also been charged under a separate investigation in relation to the administration of laurabolin, an anabolic steroid containing nandrolone, to three other horses under his care.
Johnson has for the last two days been represented by solicitor Rory Mac Neice, and the BHA by Graeme McPherson QC.
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