Dublin Bus drivers have voted by 1,029 to 96 in favour of strike action if the company decides to introduce new work rosters next month.
Members of the National Bus and Railworkers' Union announced the result of their ballot a short time ago.
NBRU general secretary Liam Tobin said the Dublin Bus branch committee will meet next week to decide what form the industrial action would take.
He said the union is likely to issue one week's strike notice to the company at that time.
Asked about media reports that the company has withdrawn plans to impose new schedules on December 4th, Mr Tobin said: "At this point in time we have received no communication from the company to that effect, although management representatives were informed as long ago as October 11th that we were planning to ballot members for industrial action."
"We remain available for talks," he added.
The ballot was held because Dublin Bus said it intended to introduce new work rosters from December 4th to comply with the Organisation of Working Time Act. The Act puts a ceiling of 48 hours on the working week for drivers.
Dublin Bus could not immediately be contacted for comment.
Progressive Democrats senator Tom Morrissey said he was concerned about the strike reports.
"Users of Dublin Bus are bound to be worried that drivers have voted overwhelmingly in favour of industrial action. Many thousands of commuters rely on Dublin Bus services daily and we must ensure that their interests are prioritised by all sides in resolving this issue," he said.
"At a time of unprecedented Government investment in public transport it is imperative that the transport companies realise that their sole objective is to meet the needs of their customers."
Mr Morrissey said he was re-assured by the NRBU statement that the union had entered talks to genuinely help the company meet its objectives while minimising the impact on workers' earnings.