The official notice to prequalify is expected on 4 June. Bids for the design and build contract is expected to come in between £46m-£65m, according to official estimates.
Work is due to start in July next year and involve an upgrade of Junction 1A on the M9, slip road improvements and widening of the existing M9 between Junction 1A and the River Almond crossing.
The successful contractor will also build a new M9 overbridge.
The total cost of the Forth Replacement Crossing projects is estimated at £2.3bn.
Two consortia are in the chase for the main bridge project.
The Forthspan consortium – which comprises Morgan Est, Bam Nuttall, Balfour Beatty and Vinci Construction Grands Projets – is up against a joint venture of Hochtief, Morrison Construction, Spanish firm ACS and US contractor American Bridge.
Tenders for the main cable-stayed bridge project are due in later this year.