Sao Paulo's metro workers have balloted to stay off work for a fifth day on Monday even after a court declared the strike illegal.
A court on Sunday set a 500,000 reais penalty ($223,000) for each day they stay off work from Monday, reports Reuters.
The strike has complicated preparations for the World Cup opening match, the report said.
It also declared the strike illegal, paving the way for state-owned Companhia do Metropolitano de Sao Paulo to lay off striking workers.
The metro workers' demand a 12 percent pay rise, but metro has offered 8.7%.
With major subway lines closed since Thursday, commuting in Brazil's largest city has been disrupted.
The strike snagged several FIFA officials in over two hours of traffic as they arrived for a conference ahead of the World Cup last week, which kicks off with a Brazil v Croatia match in Sao Paulo on Thursday.
On Friday, police used tear gas to break up a demonstration blocking access to one metro station.
