Godolphin racing manager Simon Crisford has accused Mahmood Al Zarooni of acting with "awful recklessness" after he admitted administering anabolic steroids to horse.
Al Zarooni has been disqualified for eight years by the British Horseracing Authority after he admitted giving banned performance enhancing drugs to a number of horses in the Goldolphin yard.
The trainer conceded he had made a "catastrophic error" of judgement, and Crisford is aware that Sheik Mohammad's team now have to regain the trust of British racing fans.
Describing it as "a terrible day for British racing", Crisford said: "This is a terrible situation. It's an awful situation that Godolphin has found themselves in.
"Mr Al Zarooni acted with awful recklessness and caused tremendous damage, not only to Godolphin and British racing.
"I think it will take a very long time for Godolphin to regain the trust of the British public. We're shocked and completely outraged by the actions he has taken."
Asked about Sheikh Mohammed's response, Crisford said: "He will want, first and foremost, to see this put behind us. He will want to make sure this mistake never happens again."
Racehorse Owners Association president Rachel Hood backed the severity of the punishment handed down to Al Zarooni.
She said: "The ROA was profoundly disturbed by the findings, and we wholeheartedly support the BHA's Disciplinary Panel in imposing a lengthy ban on Mr Al Zarooni.
"Horseracing in Britain is justifiably renowned for the unequivocal line that it adopts against the use of performance enhancing drugs.
"The BHA deserves credit for detecting the use of these substances and for dealing with this matter so decisively and expeditiously.
"It is also reassuring that Sheikh Mohammed and the Godolphin management team are fully co-operating with the BHA, closing the stables and testing every horse stabled there.
"Nobody should be left in any doubt that there is no place for illegal or performance enhancing substances in British racing."