Henderson is facing the prospect of a fine or a ban
Leading trainer Nicky Henderson will have a personal hearing with the British Horseracing Authority on Thursday over the Moonlit Path case.
Henderson was last week found guilty of breaching the rules of racing after the horse, who he trains for the Queen, failed a drugs test.
The 59-year-old had the right to request the personal hearing, which will be heard at 1600 BST.
He faces the prospect of either a heavy fine or a ban from the sport.
Last week, Henderson was found guilty of administering the prohibited anti-bleeding drug tranexamic acid to Moonlit Path before she finished sixth in a race at Huntingdon in February.
The Lambourn-based trainer had admitted three of the four charges he faced, but denied any wrongdoing in relation to the BHA's Rule 200, which governs administrating or attempting to administrate a positive substance.
He also insisted at that hearing that there had been no intention to enhance the horse's performance.
Moonlit Path was making her racecourse debut at Huntingdon and has since run three times.
The race was won by another Henderson-trained horse, Ravello Bay.