Godolphin racing manager Simon Crisford says he "deeply regrets" the part he played in hiring Mahmood Al Zarooni.
Al Zarooni has been banned for eight years for administering anabolic steroids to 15 of his Newmarket based horses.
Talking to Channel 4 Racing Simon Crisford said a trainer runs the day-to-day management while a racing manager looks after the best interests of the owner.
He said that he couldn't be aware of every single bit of medication that Godolphin horses were getting.
Newmarket trainer Chris Wall gives his reaction to the 8 year ban imposed on trainer Mahmood al-Zarooni who has admitting doping 15 horses at the Godolphin stables in the town.
He told ITV News Anglia's Emma Baker that the racing industry in Newmarket can and will recover from the scandal.
Racehorse trainer Mahmood Al Zarooni has been disqualified for eight years after 11 of his horses tested positive for anabolic steroids.Read the full story ›
The Newmarket horseracing trainer Mahmood Al Zarooni has been banned from training horses for eight years after horses under his care at the Godolphin stables in Suffolk were tested positive for steroids.
Godolphin trainer Mahmood Al Zarooni has been disqualified for eight years by the British Horseracing Authority are admitting doping 15 of the operation's horses.
The racehorses involved up in the Newmarket doping scandal have been suspended from running for six months.
The British Horseracing Authority said the 15 horses in question have been suspended from racing from 9 April, the day they were tested until 9 October.
"The length of suspension reflects the period beyond which the BHA is confident that the horses in question can have derived no performance-related benefit from the administration of these prohibited substances."
The decision on the horses was made by the BHA itself, rather than the disciplinary panel hearing the inquiry into trainer Mahmood Al Zarooni.
Newmarket racehorse trainer Mahmood Al Zarooni is appearing at the British Horseracing Authority headquarters to face a disciplinary hearing over doping.
Al Zarooni was surrounded by a media scrum as he entered the building in central London with Simon Crisford, spokesman for the Godolphin operation, but did not speak to waiting reporters.
The trainer was charged after tests on 11 of his horses showed the presence of anabolic steroids.
He could lose his licence as a result of the hearing, in what is one of the most significant doping scandals in recent racing history.
Newmarket-based trainer Mahmood Al Zarooni has officially been charged with rule breaches related to prohibited substances, duty to keep medication records, and conduct prejudicial to racing.
The 37-year-old will stand before a disciplinary panel of the British Horseracing Authority on Thursday afternoon after samples taken from 11 of his horses were found to have contained traces of anabolic steroids.
Al Zarooni is the trainer for Sheikh Mohammed's Godolphin stables. His Highness has condemned al Zarooni's actions, and will hold an internal inquiry into the affair.
Al Zarooni could lose his training licence for this, one of the most significant doping scandals in recent racing history.
Eleven horses from the Newmarket-based Godolphin stable have tested positive for anabolic steroids in one of the biggest doping scandals in British racing's history.
Godolphin's owner, Sheikh Mohammed is said to be appalled by the news and one of his top trainers is to face a disciplinary hearing. A number of high profile horses have been withdrawn from races.
Click below to watch a report from ITV News Anglia's Sports Correspondent Donovan Blake:
Eleven horses from the Newmarket-based Godolphin stable have tested positive for anabolic steroids.
Godolphin trainer Mahmood Al Zarooni is to face a disciplinary hearing, and a number of the stables' top horses have been withrawn from upcoming races.
Click below for a report from ITV News Anglia's Sports Correspondent Donovan Blake in Newmarket.