Sri Lanka has not yet announced an election date, but the information minister said yesterday that the polls would be held in January, when Pope Francis is due to visit.
The Church had earlier said it would be "inappropriate" for the Pope to visit any country at the time of a national election.
"We are yet to decide anything," church spokesman Cyril Gamini Fernando told AFP. "There will be a meeting of the bishops to discuss this."
An early election had been widely expected, but yesterday's announcement was the first confirmation that Rajapakse is seeking a fresh mandate after removing the two-term limit on the presidency soon after winning reelection in 2010.
More From This Section
Official sources said January 7, 8 and 9 were considered astrologically auspicious for Rajapakse and the vote could be held on any of those three days.
Rajapakse gained popularity among Sri Lanka's majority Sinhalese community by crushing a Tamil separatist rebellion in May 2009 and ending a 37-year-long Tamil separatist war.
Roman Catholics account for around six percent of the population in Buddhist-majority Sri Lanka.