Slovakia's president has asked Prime Minister Robert Fico, whose party won the country's parliamentary election, to try to form a new government.

Fico's leftist Smer-Social Democracy won the ballot on Saturday with 28.3 percent of the vote, or 49 seats in the 150-seat Parliament and needs coalition partners to rule.

In the last four years, Smer has governed alone.

Fico said President Andrej Kiska on Wednesday gave him a deadline of Friday next week.

Tough negotiations are expected after a record eight political parties made it to Parliament, including a neo-Nazi party.

Fico says he has only limited options but ruled out early elections or a government of experts.

If Fico fails, a center-right coalition led by pro-business Freedom and Solidarity party could have a chance to take power.