Green Hill had been the official provider of judogi to the International Judo Federation (IJF) for the last 11 years.

It also works with the European Judo Union (EJU), International Boxing Association and the International Mixed Martial Arts Federation.

Green Hill had been founded by Riaz’s grandfather in 1964 in Pakistan but it was Jahangir who had built the company into the well-known brand that it is today.

"He was a gentleman who put his talent at the service of sport," the IJF said in a statement on its website.

Sergey Soloveychik, the President of the EJU, also paid tribute to Riaz.

"The EJU family is deeply saddened by the sudden death of our friend," he said.

"He will always remain in our memories and hearts as a very kind and friendly person, a great personality, a big professional.

"Our thoughts are with Jahangir’s family now, we present our sympathies over this shocking loss."

AIBA marked the death of Riaz by saying that "the activity of Green Hill…allows many athletes to compete at a world level and create more opportunities for sports organisations to operate well and host diverse events".

The IMMAF chief executive Densign White expressed his shock at the news of Riaz’s death on the Federation’s Facebook page.

"Jahangir was a great believer in youth development through sport and sport’s capacity to change lives," White said.

"His values resulted in his sponsorship of International Federations across amateur sport and through this he will have touched the lives of many, leaving behind him a resounding legacy.

"I give my heartfelt condolences to Jahangir’s family and friends.

"He will be very much missed."