Gandhi has called the meet in the midst of a political row over alleged phone tapping of opposition leaders, judges and journalists and rowdy scenes in Parliament.
Fadnavis, a former chief minister, did not elaborate whether he meant joining hands with the MNS or going solo in the general polls.
Leaders of at least 15 opposition parties attended the breakfast meeting convened by Congress leader Rahul Gandhi at the Constitution Club in Delhi.
The TMC chief’s statement is significant considering that she has been trying to cobble together an Opposition alliance to take on the NDA in 2024.
Though what exactly transpired at the parleys is not known yet, media speculated a broad-based coalition against the Centre's ruling NDA might have been on the agenda.
The meeting was chaired by Nationalist Congress Party supremo Sharad Pawar and attended by party leaders Supriya Sule, Praful Patel and Sunil Tatkare among others.