HANOI, Oct 2 (Reuters) - Vietnamese conglomerate Masan Group said on Monday it has secured funding of at least $200 million from Bain Capital in the private investment firm's first investment in Vietnam.

Masan is also in discussion with other investors to upsize the investment to up to $500 million, subject to market conditions, it said in a statement (Reporting by Phuong Nguyen; Editing by Martin Petty)