Tissera's office has sent out proposals to reform the co-operative banking sector to 306 societies over the past two weeks.
The Asian Development Bank (ADB) sponsored reforms looks at splitting the trading and banking activities, with separate balance sheets.
While each unit will have a separate manager, a single chief executive officer would oversee both activities.
Earlier some co-operatives objected to divorce banking activities from the main multi-purpose co-operative society. The restructuring is financed by the ADBs Rural Finance Sector Development project.