Former Metropolitan police chief Lord Stevens will conduct an internal inquiry into the global racing empire of Sheikh Mohammed.

He has already begun the process of "assembling a team of experts" for an investigation which is likely to continue into the new year.

Sheikh Mohammed's racing organisations were placed under the spotlight after former Godolphin trainer Mahmood Al Zarooni was found to have given banned anabolic steroids to 22 of his horses in April.

A consignment of veterinary products from Moorley Farm, which is owned by Sheikh Mohammed's Darley Stud Management Co Ltd and is used for training endurance horses, was seized in Newmarket in August.

An illegal shipment of unlicensed veterinary products was also taken from a Dubai Royal Air Wing Flight by UK Border Force and the Veterinary Medicines Directorate at Stansted airport in May.

Last month the British Horseracing Authority said it had been assured the seized products were not related to racing, a stance it reiterated on Monday.

Lord Stevens was asked to spearhead the inquiry following a meeting with Princess Haya, Sheikh Mohammed's wife and the president of the International Equestrian Federation.

"I have been asked by His Highness Sheikh Mohammed to oversee an internal inquiry that will examine organisational structures, internal communication and veterinary practices at all of the major components of Sheikh Mohammed's equestrian properties and operations, including Darley, Godolphin, Meydan and Janah, the equine flight company," Lord Stevens said in a statement.

"Sheikh Mohammed is adamant that any evidence of violations of law or regulation in any jurisdiction should be shared with the appropriate authorities.

"Our primary focus is on preventing any future systemic failures.

"Following my meeting with Princess Haya on Tuesday, I have begun assembling a team of experts for this task.

"We have agreed that we will not wait until the inquiry is finished to suggest any improvements that should be implemented more quickly."