Bryan Fogel, the director of Icarus, the Oscar-nominated film which revealed the extent of Russia's state-sponsored conspiracy, told BBC Sport that his friend had mentioned competitors who he was "fairly positive" were cheating.
Rodchenkov, who is now in hiding, also criticised testing at the London 2012 Games, describing it as "a mess".
The evidence provided by Rodchenkov, the former head of Moscow's anti-doping laboratory, led to Russia being banned from the Winter Olympics, which begin on 9 February.
Where is my big surprise face. Two that stand out for me:
1. How did the dwarf beat the giant who as we now know was doped to the gills.
2. The one who could not defend her title.