Mayor Martin J. Walsh said he received reassurance today from a Boston 2024 official that Boston’s Olympic bid has the backing of the United States Olympic Committee — a day after a USOC member's comments cast doubt on the plan and turned a fresh spotlight to potential bid city Los Angeles.

Steve Paglicua, the Boston Celtics co-owner who is expected to assume chairmanship of Boston 2024 soon, “basically assured me that the USOC’s committed to Boston,” Walsh said this morning.

Walsh’s comments come after USOC member Angela Ruggiero told the Boston City Council yesterday the organization is going through a “vetting process to ensure that Boston is the right city” and that “there’s no guarantee that Boston will be the city in September” — when the USOC casts its final vote on which American city, if any, will compete internationally for the 2024 Summer games.

Boston beat out L.A., San Francisco and Washington D.C. in December to become the USOC’s pick to try to win the Summer Games in 2024 against competing international cities including Rome, Paris, Hamburg and Budapest.

Walsh today stopped short of saying he’s confident Boston will get the Games.

“We’re moving forward. I don’t know if I can say confident,” Walsh said. “Certainly I am encouraging that we move forward here. We’ll see what happens. There’s still a long way to go.”

Rumors have persisted that Los Angeles, which has twice hosted the Games, most recently in 1984, might be called to step in if public support for a Boston Olympics doesn’t improve. Prominent L.A. officials told the Herald yesterday that the West Coast hub has the will and the wherewithal to step in if need be.

“I read the papers today and there was some comments from some folks in L.A. criticizing Boston, I think that’s kind of unfair. But I think we’re going to continue to move forward,” Walsh said. “I don’t think it’s a question of if Los Angeles can do it better than us. We certainly can host the Olympics. We can put on one of the best games in the history of the Olympic movement.”

Walsh said the questions around the Boston Olympics now are “about the cost and about the venues,” specifics Boston 2024 said yesterday it will unveil in a “Version 2.0” of its plans next month.

“That’s where we are,” Walsh said, “and I think if we can get that information out to the public and the public can understand and feel comfortable there, we’ll be in better shape.”

This morning on Boston Herald Radio, transportation secretary Stephanie Pollack said the Baker administration is withholding judgment on the bid until Boston 2024 provides the full financial and venue details, expected next month.

“What the governor has said is that we can’t really give you an intelligent answer to how the Olympics would work or would transportation be able to work with the Olympics until we have their plan, which we’re expecting to get in June,” Pollack said. “So, we’re just in the final stages of working with the legislature to hire an independent consultant and once we have the plan from the Olympics, we are going to be able to use that consulting team to really scrub their plans and understand is this realistic or not.”

Pollack remained adamant that no taxpayer dollars should be used to bring the Olympics to Boston.

“The whole premise of the Olympics is that it only makes sense if we’re not using public dollars,” Pollack said. “The public dollars need to go into infrastructure and meeting all the other needs that the state has.”

Asked her personal opinion of the Olympics bid, the transportation czar joked: “The good news is that it’s not the winter Olympics.”