The new swaps, which expire at the beginning of July and August of 2014, will be offered at an auction on Tuesday around 2:30 p.m. (1630 GMT), the bank said in a statement.

Brazil's central bank has been regularly selling swaps as part of a daily intervention program that provides investors with a hedge against a possible depreciation of the real. About $8.9 billion of the contracts sold so far mature on Nov. 1.

Speculation the bank would not roll over part or all of the expiring swaps had been growing because the real recently strengthened past 2.2 per dollar to nearly four-month highs.

The real closed on Monday at 2.1812 per dollar, 0.3 percent weaker than Friday's close.