"That's a process we've been going through with all those riders," Ellis said.
"It's a salient lesson to all people in the sport. We are strong supporters of Clean Sport (FEI anti-doping programme), the rules are clear around what can and can't be in horses systems and it's difficult with horses, there's no question about that."
Ellis said it is unlikely the hearing will take place before the latter part of the first quarter of next year, leaving Paget's ability to earn a living down to private lessons. He was stood down by EQNZ, as per FEI regulations, when the A sample failed.
"If there is a silver lining it's that it is the European off-season, so having missed the final event in France (the Pau four-star late last month) there isn't any competition until March," Ellis said.
In a statement Paget, part of New Zealand's bronze medal-winning team at last year's London Olympics and world No3 at the time of the Burghley win, said he is confident of providing a comprehensive explanation to the FEI.
Ellis backs Paget's positive stance.
"We do have real confidence that Jock can present a really plausible and persuasive case to the FEI," he said.