Justin Gatlin 'shocked' as he faces new scandal with coach and agent set for anti-doping investigation

Reports in English media that coach Dennis Mitchell, who Gatlin has reportedly fired, and agent Robert Wagner offered to provide false prescriptions for banned performance-enhancing substances

Justin Gatlin, right, who has been banned for doping twice in the past, beat Usain Bolt, left, at the 100m at the World Championships in the summer in London. Matt Dunham / AP Photo

World 100 metres champion Justin Gatlin says he is "shocked and surprised" by allegations in a British newspaper that his coach and an athletics agent offered to sell performance-enhancing drugs to undercover reporters.

Anti-doping officials have launched an investigation into the claims in the Daily Telegraph about Gatlin's coach Dennis Mitchell and an agent, Robert Wagner.

The 35-year-old American sprint star, who has twice served bans for doping, said he had sacked Mitchell after hearing of the claims.

The report alleged Mitchell and Wagner offered to provide undercover reporters with false prescriptions for banned performance-enhancing substances and smuggle the drugs into the United States.

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The claims are being investigated by the Athletics Integrity Unit (AIU), set up this year by the International Association of Athletics Federations (IAAF) and the US Anti-Doping Agency (USADA).

Gatlin said on Instagram: "I was shocked and surprised to learn that my coach would have anything to do with even the appearance of these current accusations. I fired him as soon as I found out about this."

He said he was "not using and have not used" performance-enhancing drugs.

He added: "All legal options are on the table as I will not allow others to lie about me like this."

A spokesman for USADA said the report would be examined carefully.

"Investigations stemming from tips and whistleblowers play a critical role in anti-doping efforts," a spokesman told the Telegraph.

"We are presently coordinating with the Athletics Integrity Unit in order to investigate these claims fully."

IAAF president Sebastian Coe said the claims were concerning.

"These allegations are extremely serious and I know the independent Athletics Integrity Unit will investigate in accordance with its mandate," Coe said.

That came even as the 2017 world champion, who beat Usain Bolt in the 100m final in London, had legal advisers release five years of official drugs tests that showed he was clean.

Gatlin has long been a controversial figure after being banned for doping in 2001 for one year and in 2006 for four years.

His long-time agent, former sprint hurdler Renaldo Nehemiah, told the newspaper that Wagner had represented Gatlin only two to three times and that Gatlin was not present when banned substances were allegedly discussed with Mitchell or Wagner.

Mitchell and Wagner allegedly offered to supply and administer testosterone and human growth hormone for an actor training for a film on athletics at a price of $250,000 US$250,000 (Dh918,100), according to the report.

The newspaper said it began its investigation in July after hearing of agents and trainers involved in supplying drugs to athletes.