The source said PKO BP, Poland's largest lender by assets, and Alior, controlled by state insurer PZU PZU.WA, submitted offers on Tuesday. It was unclear whether they were the only bidders.
Raiffeisen and PKO BP declined to comment, while Alior was not immediately available.
Sources told Reuters earlier this ear that potential bidders also include Spain's Banco Santander (SAN.MC), France's BNP Paribas (BNPP.PA) and Dutch lender ING ING.AS.