In an interview with an Indian television network on Friday, Fonseka had warned that Rajapakse was out to rig the election and said he feared a violent campaign.
"You can see the election is going to be a very violent election and we want every friendly country to put pressure on the president to ensure democracy is established," he told the NewsX network.
Both Fonseka and Rajapakse are from Sri Lanka's majority Sinhalese community and appeal largely to their own ethnic group. Both claim credit for the final defeat of the Tiger rebels in May, which ended a decades-old ethnic conflict.
The possibility that they might split the Sinhalese vote has added weight to the intentions of the Tamil electorate and officials said Rajapakse, 64, was expected to visit Jaffna later this month.
The defence ministry effectively blocked independent journalists travelling to Jaffna, even though the authorities had announced last month that travel restrictions had been withdrawn.
Rajapakse called the early January poll in a bid to capitalise on the victory over the separatist Liberation Tigers of Tamil Eelam (LTTE) who had launched their campaign for a Tamil homeland from Jaffna in 1972.
Fonseka and Rajapakse have been at loggerheads since the end of the conflict. Fonseka quit after accusing the government of sidelining him and falsely suspecting him of trying to stage a coup. (AFP)
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