Olympics chiefs are meeting in Rio de Janeiro to review the final preparations for the games and deal with the fallout from the doping scandal that has led to the exclusion of more than 100 Russian athletes.
The International Olympic Committee's ruling executive board opens a two-day meeting on Saturday, its last formal gathering before next Friday's opening ceremony at the Maracana stadium.
The meeting comes less than a week after the IOC board decided not to ban Russia's entire team from the games because of state-sponsored doping.
Rejecting calls by more than a dozen anti-doping agencies for a complete ban on Russia, the committee left it to individual sports federations to vet which athletes could compete.
Russian sports minister Vitaly Mutko said so far 272 of the country's athletes had been cleared by international federations, out of an original team of 387.
More than 100, however, have been barred, including the athletics team banned by the International Association of Athletics Federations (IAAF) and more than 30 other athletes rejected under new IOC eligibility criteria.
Russia's eight-member weightlifting team was kicked out of the games on Friday for what the international federation called "extremely shocking" doping results that brought the sport into "disrepute".
The IOC has been roundly criticised by anti-doping bodies, athletes groups and Western media for not imposing a total ban on Russia.
Pressure for the full sanction followed a World Anti-Doping Agency report by Canadian lawyer Richard McLaren that accused Russia's sports ministry of overseeing a vast doping conspiracy involving the country's summer and winter sports athletes.
IOC president Thomas Bach has defended the decision as protecting individual athletes from collective punishment.
"This is a decision we just had the opportunity to discuss with some athletes," he said in Rio.
"I think the general feeling is that it is appreciated that, on the one hand, we are sanctioning a (doping) system, but on the other hand we have given athletes who were not part of the system the opportunity to demonstrate this and then to be allowed to take part in the Olympic Games."
Rio's preparations, meanwhile, remain clouded on several fronts, including budget cuts, raw sewage that pollutes the sites of rowing, sailing, canoeing, open water swimming and triathlon, slow ticket sales, and concerns over crime and the Zika virus.
The games come with the president awaiting an impeachment trial and the country gripped by a severe recession.
The Australians and at least eight other Olympic teams complained this week about their accommodation in the athletes' village, citing plumbing leaks, electrical faults and dirty conditions.
On Friday, Australian athletes and staff had to be evacuated from their building after a small fire broke out in the basement. They returned safely after about 20 minutes.
Nevertheless Mr Bach remains publicly upbeat.
"In the end you will see a fantastic Olympic Village and great games," he said. "The Brazilians will overwhelm all of us with their passion, with their joy of life, their great hospitality, and with their energy."
The full IOC will hold a three-day session next week, starting on Tuesday. A top item on the agenda is Wednesday's vote on a recommendation to add five sports to the programme of the 2020 Tokyo Olympics - baseball/softball, surfing, karate, skate boarding and sport climbing.
The proposed sports - backed by the executive board and to be voted on as a package - would add 18 events and 474 athletes to the programme.
An IOC programme commission report released on Friday said the five sports were a blend of the traditional and emerging, youth-focused events, and all had international and local appeal.