The bombshell publication of a WADA-commissioned report this month which detailed a vast state-backed Russian scheme to evade drug-testers, left the IOC scrambling to formulate a policy for Russian athletes aiming to complete in Rio de Janeiro.
In reaction to the report by Canadian lawyer Richard McLaren, the IOC did not order a blanket ban on Russian participation in Rio, instead leaving individual sports federations to determine which Russian athletes could take part.
IOC president Bach rejected suggestions at a press conference that the IOC was to blame for the legal imbroglio.
Asked if he felt the saga represented a "huge failure" of the IOC, Bach replied tersely: "No. And this is for very obvious reasons. The IOC is not responsible for the timing of the McLaren report.
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"The IOC is not responsible for the fact that different information which was offered to WADA ready a couple of years ago was not followed up."
WADA has said it did not have the power to act on the information and insisted that its priority was to protect Stepanov and his wife Yulia Stepanova, who are now living in hiding in the United States.
Bach meanwhile added the IOC had no responsibility for overseeing the accreditation or supervision of anti-doping laboratories, which falls under WADA's remit.
"So therefore the IOC cannot be made responsible neither for the timing nor for the reasons of these incidents we have to face now and which we are addressing and have to address just a couple of days before the Olympic games," Bach said.