The possibility that Los Angeles would abandon a 2024 bid and accept the 2028 Games instead has been growing since the International Olympic Committee decided in July that it could award not only 2024 but also the 2028 games in its vote in Lima on September 13 - effectively ensuring that the two candidates will each host a Games.
Los Angeles will host the 2028 Summer Olympics after reaching a deal with Olympic organizers, a source close to the negotiation told Reuters on Monday, a move that paves the way for Paris to host the 2024 Games.
The IOC vote is scheduled for September, in Lima, Peru.
Los Angeles and LA 2024 officials had no immediate comment on the report, although City Councilman Gil Cedillo posted on his Twitter page, "Hastag goes from #LA2024 to #LA2028".
A statement from the LA Bid Committee said: "Since his election, President Trump has been personally involved in helping to make LA's bid a truly American bid and the White House Office of American Innovation and the US Senate and House of Representatives have been true partners throughout".
Los Angeles will host its third Summer Olympics, but will have to wait four years longer than it had initially hoped.
Mayor Eric Garcetti says 2028 was a better deal for the city that could bring hundreds of millions of dollars more to Los Angeles.
The two cities were the only ones left in the race for 2024 after Budapest, Hamburg and Rome withdrew.
Los Angeles - the site of the Summer Olympics in 1932 and 1984 - had argued that it could host a low-priced Olympics given that it already has all the necessary infrastructure in place, while Paris would need to build several expensive structures.
"They presented a strong and enthusiastic candidature that embraces the Olympic Agenda 2020 sustainability priorities by incorporating existing facilities and encouraging the engagement of more youth in the Olympic Movement".
International Olympic Committee president Thomas Bach said in July he hoped a "tripartate agreement" could be struck by the end of August that would allow the body to prepare for its Lima with the prospect of awarding both Games.