SÃO PAULO, Brazil — Brazil’s two largest cities may be on the verge of banning Uber’s service, adding to the ride-hailing service’s growing list of regulatory problems.

City Councils here and in Rio de Janeiro recently passed bills that would prohibit Uber and other ride-hailing services like it. Now Rio’s mayor is planning to issue a decision on whether he will sign or veto one of the bills no later than Tuesday, with the mayor here expected to decide early next month.

Uber’s prospects are not looking good.

“Our path is signing it, unless there is some irregularity or unconstitutionality,” Eduardo Paes, Rio’s mayor, said this month. Fernando Haddad, the mayor of this city, said the proposed ban was “in line with how our administration thinks.”

To stave off prohibition, Uber has noted its capacity to provide jobs in Brazil, which has been dealing with an economic crisis. The company, which is based in San Francisco, released a statement two days after the council vote here in which the company promised 30,000 jobs for drivers by October 2016.