The number of Venezuelans entering Brazil is rising, officials say, despite Saturday's attacks on makeshift migrant border camps.
A Brazilian army spokesman said about 900 Venezuelans were expected in the state of Rorarima on Monday, a steep rise in the daily average.
The numbers of people trying to flee Venezuela's economic collapse are stoking regional tensions.
There is fresh uncertainty following the issuing of new banknotes.
Banks and shops are due to reopen on Tuesday after a public holiday on Monday, when the left-wing government lopped five zeros off the bolívar and anchored it to a new virtual currency called the petro.
The government says the move is needed to tackle runaway inflation, but critics say it could lead to even more chaos.
Opposition groups have called for strikes and protests on Tuesday.
What is happening in Brazil?
Extra security forces have been sent to the border with Venezuela following violence near the town of Pacaraima on Saturday.
The Roraima state government has asked the Supreme Court to temporarily halt the entry of migrants from Venezuela, saying social services were being overwhelmed.
The army said that on Sunday about 800 Venezuelan migrants arrived in Roraima, about 300 more than the average number crossing every day for almost a year.
In Pacaraima on Saturday, several migrant encampments were attacked by angry residents following reports that a local restaurant owner had been badly beaten by Venezuelans.
Hundreds of migrants fled back across the border and gangs of men burned their camps and their belongings. Reports on Monday said many had since crossed back into Brazil.
There has been growing animosity towards the numbers of Venezuelans entering Roraima in recent months.