Ulster Unionists are expected to nominate three representatives to the new Policing Board, although the government has asked for two names.
Sir Reg Empey is to put three names forward
The party disagrees with the formula used to decide the make-up of the new board, due to take office in April.
Last week NI Secretary Peter Hain wrote to the four main political parties inviting them to make nominations.
He gave the DUP four places on the new board and the Ulster Unionists two places.
That reflects the strengths of the parties in November last year when the government invited independent members to apply for the board.
The Ulster Unionists argue that the government is not reflecting either the result of the 2003 elections or the position since last month's resignation from the DUP of the Newry and Armagh MLA Paul Berry.
UUP leader Sir Reg Empey believes the government should be doing its sums on the basis of the 2003 Assembly results prior to the defection of Jeffrey Donaldson and two other Ulster Unionists.
That would give the UUP three seats on the new board.
Sir Reg is expected to nominate his deputy Danny Kennedy, the North Belfast MLA Fred Cobain and the Fermanagh MLA Tom Elliot.
Sinn Fein has confirmed that it will not be making nominations for its two allocated places at this stage.
The SDLP have been asked to put forward two nominations, which is a reduction in their team.
Sinn Fein has resisted giving the PSNI, the Policing Board and other institutions its support, insisting more legislation is needed before it can sign up.
The party said it needed to see more power transferred to local politicians before it would consider nominating representatives.