Williams said although he and other administration officials hope the bill passes Monday, “it’s not the end of the world” for the soccer stadium plan if it doesn’t.

He said the measure could be reintroduced when the board opens its 2019-2020 session on Tuesday and go through the legislative process again.

Moreover, he said, there are alternatives to the 1 percent port authority sales tax that could be explored by the city and the group seeking an MLS franchise here.

“The ownership group and the city only offered this up as one alternative,” he said. “There are other vehicles that can be created.”

Representatives of the prospective ownership group could not be reached for comment. MLS owners are scheduled to meet in Los Angeles on Thursday. The league is considering adding one expansion team; MLS Commissioner Don Garber has identified St. Louis and Sacramento, Calif., as leading contenders.

Some aldermanic critics say they worry that the measure would cede to the port agency aldermanic authority citywide over powers such as eminent domain.