"We are allotting them a seat in opposition both in Lok Sabha and in Rajya Sabha," he added.
The trio - Shiv Sena, Congress and the NCP are making efforts to form a non-BJP government in Maharashtra where the President's Rule was imposed earlier this week. The three parties have prepared a draft for their common minimum programme (CMP).
The Shiv Sena and the BJP, who fought the polls together, could not form the government due to differences over power-sharing.
The BJP emerged as the single-largest party in the state with 105 seats in 288-member assembly followed by Shiv Sena 56, NCP 54 and Congress 44.