The E.U. in a statement Wednesday asked that the new election be held in full compliance to international standards.
"The international community recognized the outcome of the first round on Sept. 7 as inclusive and credible. Under these circumstances, I urge that elections planned.take place in full compliance with national and international standards and that the Maldives democratic institutions are safeguarded and the will of the people respected," said Catherine Ashton, the E.U. high representative.
In the first round, Mohamed Nasheed, who became president in the country's first multiparty election in 2008, led with more than 45 percent of the vote while Yaamin Abdul Gayoom, brother of former 30-year autocrat Maumoon Abdul Gayoom came second with 25 percent.
But businessman Qasim Ibrahim who finished a close third complained that he was denied a runoff slot because of a flawed voters' register. The difference between him and the second place was about 2,700 votes.
Known for its luxury island resorts, Maldives has had a difficult transition in the five years it has been a democracy with state institutions like police, elections commission judiciary and the public service all being questioned over their alleged loyalty to the leaders of the former autocratic government.
Nasheed resigned from presidency last year amid public protests and losing support from the military and police over his decision to arrest a senior judge accusing him of corruption.
Though a local inquiry commission has dismissed his claim that he was ousted by a coup at gunpoint, the country remains politically polarized.