According to the report, the company should announce the capital increase on Monday and aims to raise between 1 billion reais and 1.5 billion reais at one real per share, representing a discount of 56.7% from Friday's closing price of 2.31 reais.
In July, analysts at Genial Investimentos raised an alert on IRB's capital sufficiency.
IRB did not immediately respond to a request for comment.
($1 = 5.0719 reais)
(Reporting by Carolina Pulice and Peter Frontini; Editing by David Gregorio)