Siddaramaiah had two rounds of talks with AICC General Secretary Digvijay Singh after which he met party Vice President Rahul Gandhi, according to sources.
The move was aimed at accomodating the legislators who were unhappy with the party for not making them ministers in the recent Cabinet reshuffle.
There are three vacancies under the nomination category in the Upper House of the legislature, while the ruling party can nominate heads to 70-odd state-run boards and corporations.