Mahinda Rajapaksa is widely expected to seek re-election after Sri Lanka's Supreme Court last week rejected an opposition challenge to the removal of a two-term limit on the presidency.
"After completing four years in his current (second) term, the president now has the constitutional authority to seek a fresh mandate from the people," his spokesman Mohan Samaranayake told AFP.
Samaranayake did not say when Rajapaksa would issue a proclamation seeking re-election -- the next step towards polls -- but official sources said it could happen within 24 hours.
Information minister Keheliya Rambukwella recently said elections could be held around January 7 or 8, and today the state-run Daily News brought out a special 92-page supplement on the president's administration.
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However, celebrations for Rajapaksa's 69th birthday were marred yesterday when a key coalition partner, the JHU or the National Heritage Party of Buddhist monks, quit his government in protest at his failure to loosen his grip on power.
Official sources said Rajapaksa was keen to secure another mandate before his party's popularity falls further.
Rajapaksa won the presidency in 2005 promising to return the country to a Westminster-style parliamentary democracy.
But he secured a second term in 2010 and rewrote the constitution, removing the two-term limit on the top job and giving himself more powers over the entire administration.
The JHU supported Rajapaksa's election in 2005 and backed his moves to end a decades-long separatist war by crushing Tamil Tiger rebels in 2009.
With just three seats in the 225-member parliament the JHU lacks the power to destabilise the government, but the monks are considered influential among the country's majority Buddhist community.