Cabinet spokesman and Minister of Mass Media and Information Keheliya Rambukwella yesterday said the poll would be held in January next year.
Rambukwella said although he knew the exact date of the poll, but could not confirm it at the moment.
He, however, said the date of the election would be announced soon, the Ada Derana online reported.
Speaking during a ceremony to commence development projects in the Kundasale Electorate in Kandy, Rambukwella called on every person in the country to set aside their differences and work for Rajapaksa's victory in the election.
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Rajapaksa, 68, came to power in 2005 and retained the presidency in 2010 on a wave of popularity after the Tamil Tigers were defeated in 2009, ending a nearly three-decade war.
The 2009 victory over the Liberation Tigers of Tamil Eelam (LTTE) helped Rajapaksa secure more than two-thirds of parliamentary seats, enabling him to amend the constitution that had capped the presidency for a leader to two terms.
Rajapaksa's current term ends in November 2016, but he can call for an early election after November 19 this year, according to the Sri Lankan constitution.
He said the budget proposal for 2015 would be presented to the Parliament on October 24.
The government move to bring the budget forward is likely to give Rajapaksa more time to campaign.