"The checks are underway. A re-check of 250 samples is taking place. I expect the results to be released this month," Bach said in an interview with the German Stern magazine.
So far, the IOC said it has re-tested hundreds of samples from the Beijing games, with hundreds of re-testing results from London medalists soon due to come shortly. Over 30 athletes from six sports could be banned from taking part in the upcoming Summer Olympics due to take place in Brazil's Rio de Janeiro in August.
"To suspend an entire national athletics team would, in one sense, subject clean athletes to collective responsibility. In another sense, we carry heavy responsibility for the games and intend to defend Olympic values. We are faced with a dilemma. There will be criticism whatever we do," he said.
The IOC and the World Anti-Doping Agency (WADA) also plan to investigate allegations of doping misconduct at the Sochi laboratory during the 2014 Olympics. Russian Sports Minister Vitaly Mutko dismissed all accusations as "absurd" stressing that Moscow had already embraced all recommendations made by international sports organizations and ensured proper doping control.
In November 2015, WADA's Independent Commission issued a report accusing Russia of numerous breaches of global anti-doping regulations. As a result, the IAAF temporarily suspended the Russian Athletic Federation's membership.