German journalist Hajo Seppelt said he is prepared to make a second documentary about doping in Russian sport after saying his first has led to more evidence being unveiled.

“To be honest we did not plan a sequel, however, people are sending us more and more evidence to back the claim that there is systematic doping in Russian sport,” Seppelt told reporters.

“So, I do not want to categorically rule out such a move. If it is needed, we will film a second part.”

The programme, broadcast in three parts by ZDF/ARD, featured an undercover video of what it said were Russian athletes and coaches admitting to covering up positive tests.

The allegations have not been verified by Reuters and the head of Russia’s Athletics Federation (VFLA), Valentin Balakhnichev, denounced the claims as “a pack of lies”.

Balakhnichev, however, has stood down from his role as treasurer of the IAAF while the claims are investigated.

Seppelt compared the current situation with that of the Soviet era.

“Old traditions die hard in your country, which has continued from Soviet and East German times at the end of the 80s,” he said.

“During this time, sportsmen were given illegal stimulants on a mass scale. I cannot and will not understand such a stance towards sport no matter who it involves or where it is happening.”