Bus Eireann are expected to tell their employees that the deadline for the loss-making company to sign off on cuts is next Monday.
The date that the board will nail down changes to work practices and efficiencies will be translated in a letter to the 2,600-strong workforce.
Management will also likely set dates to axe or reduce services on five separate routes at the Monday meeting.
Passengers could face travel disruption as it is expected that union members will respond by taking to the picket lines.
Unions have already warned management that implementing cuts without agreement with staff may lead to an all-out strike - which could include CIE and school bus drivers.
Last week, Bus Éireann asked trade unions representing workers to agree to a reduction in overtime for drivers, in order to save €5m a year.
Bus Éireann lost €9.4m last year, and has been trying to secure a total of €30m in savings, with €12m of that from payroll.