The French government is threatening to force striking train drivers back to work, to ensure travel for fans attending the European Championship, which begins today.
Unions are targeting the commuter train lines serving the national stadium hosting the opening match in Paris, as part of nationwide strikes over working conditions in recent weeks.
Alain Vidalies, junior minister for transport, insisted that travel to the opening match would be ensured.
But asked if the government would use special measures to force train drivers back to work for reasons of public order, Vidalies said on Europe-1 radio that if transport problems worsen on Saturday, "we will do it".
Rubbish collectors are also on strike in some areas, and Air France pilots are going on strike, starting on Saturday.
Mayor of Paris Anne Hidalgo has promised to clear all city streets of rubbish by the end of the day, after 12 days of strikes that have left a stinking mess.
Unions remain determined to keep up strikes at the main Paris waste incineration plant.
Ms Hidalgo said the city has brought in dozens of extra lorries over the past two days to clear the accumulated rubbish, which is becoming especially odorous in the warm, muggy weather.
"All the rubbish will be collected today," she told BFM television on Friday.
The challenge will be finding a place to dump it. Striking workers have blocked the main waste plant serving the city for several days.
Baptiste Talbot of the CGT rubbish collectors' union said Hidalgo's prognosis was "a bit optimistic", but did not object to the move. "We want to maintain pressure with the strike, but we are sensitive to sanitary issues," he said.
He said the city could requisition private companies to clear streets normally served by public workers, and then take the rubbish to other regions or plants where workers are not on strike.
Meanwhile, railway and Metro authorities promised extra trains to bypass the strikers and carry 70,000 people to the stadium to watch France against Romania at the Stade de France on Friday.