The UNP parliamentary group is expected to meet today under the auspices of former Prime Minister Ranil Wickremesinghe.
When the UNP group met last week, there was a heated situation over the issue of changing the party leadership.
The turbulent situation forced the UNP leader Wickremesinghe to end the meeting abruptly and adjourn the proceedings.
The majority of parliamentary group members have unofficially pledged support for Premadasa to become the party leader.