The hosting rights for both the 2024 and 2028 Olympic Games should be awarded at the same time, the International Olympic Committee's executive board recommended on Friday.
Paris and Los Angeles are the only candidates left in the race for 2024 and, if passed, the recommendation would almost certainly mean that each would host one of the next two summer Games, with only the order still to be decided.
IOC president Thomas Bach said the recommendation would be put to an extraordinary IOC session in Lausanne in July.
Decision in September?
There is a further IOC session in Lima in September which was originally scheduled to choose the 2024 hosts and may now decide whether Paris or Los Angeles go first.
“Having two such great cities, two such great countries, two candidates who are really enthusiastic and promoting the Olympic Games and the Olympic spirit ... this represents a golden opportunity for the Olympic Games,” Bach told reporters.
“It is a win-win-win situation.”
Bach heavily implied that, if the recommendation was passed, there would be no chance for other candidates to enter the race for 2028. He also denied that getting the 2028 would be a consolation prize.
"It is a fascinating race to have Paris and Los Angeles striving for the Olympic Games, it is hard to imagine something better and it is a very strong sign of stability," he said.
Bach praised both cities for including a high number of existing venues in their plans, saying this would “lead to significant cost reductions in the organization of the Games and make them more sustainable and more feasible.”
The Paris and Los Angeles organizing committees both welcomed the announcement.
Cities pulled out of bidding
The Olympic Games, once perceived as the hottest of sports properties, is now seen by many cities as a liability that can potentially drag an entire country's economy down.
Rome, Budapest, Hamburg and Boston all pulled out of bidding for 2024.
Bach said the board had proposed the same 28 sports for 2024 which featured in Rio de Janeiro in 2016, provided they “comply with the Olympic charter and this includes the world anti-doping code.”
Extra pressure on weightlifting
But he said there was an extra condition for weightlifting, which has been plagued by doping with numerous participants testing positive in re-tests of samples from the 2008 and 2012 Olympics.
"The International Weightlifting Federation (IWF) has until December 2017 to deliver a satisfactory report to the IOC on how they will address the massive doping problem this sport is facing," he said.
He added that the IOC had already sent a warning to the IWF by reducing the number of athletes for the 2020 Tokyo Games from 260 to 196.