The Scottish Council, where unions and employers negotiate pay and conditions, will meet on Thursday 8 May.
Unison last month warned its Scottish local government branches to prepare for strike action if employers refuse to honour the pay package currently on offer to council staff nationally (LGC, 11 April).
This package represents a final non-negotiable offer from UK employers. It was agreed in principle in March, but Scottish employers want implementation delayed for a year because of financial pressures.
Unison head of local government in Scotland Mark Irvine said: 'We'll be saying to them that we expect you to implement the offer in full.'
The union has made clear it will not accept any change to the content or implementation date of the package, which is due to be backdated to 1 April.
But Mr Irvine said there will be room for negotiation on a new national job evaluation scheme, which has yet to be designed. This will redistribute pay and harmonise conditions between manual and white-collar and male and female workers.