On Thursday the Court for Arbitration for Sport overturned life bans imposed on 28 Russian athletes linked to a Russian state-sponsored doping scheme, ruling them potentially eligible for participation in the Winter Olympics.
The IOC must wait for a reasoned decision from CAS before an appeal can be launched.
"We feel this decision shows the urgent need for reforms in the internal structure of Cas", he added.
They will compete under the Olympic flag as "Olympic athletes from Russia".
The Games begin on Friday and end on Feb 25, with a fresh doping scandal threatening to erupt on the eve of the quadrennial event.
Bach added that the IOC is still to receive from the Russian Olympic Committee the U.S. dollars 15million fine demanded in December.
Japan is sending a 269-member delegation to the Olympics, the largest for any Winter Games held outside the country.
The United States and South Korea have agreed to delay annual joint military exercises until after the February 9 to 25 games and the March 9 to 18 Winter Paralympics in South Korea.
Speaking at a news conference in Pyeongchang, South Korea, five days before the opening of the Winter Olympics, Bach said the International Olympic Committee had been told no full explanation of the verdict would be released until the end of February.
International Olympic Committee earlier announced it would not invite some leading Russian athletes to the Olympics, among who are short-track skater Viktor Ahn, biathlete Anton Shipulin, skier Sergei Ustyugov, speed skaters Pavel Kulizhnikov and Denis Yuskov, and figure skaters Ksenia Stolbova and Ivan Bukin.
"I want to make it clear that absence of sanction by CAS does not mean you are entitled to receive invitation by the IOC", Bach said.
The IOC executive board has expressed disapproval with the governance of amateur boxing's world governing body AIBA.
'Unfortunately, here in Pyeongchang, this reallocation of medals can not happen yet, ' Bach said.
In their statement they also emphasised that decisions regarding the event and athlete quota for the Olympic Games Tokyo 2020 are final, in the case of boxing this refers to the decision to reduce the number of men's weight divisions from 10 to eight and increase the number of women's weight categories from three to five.