SOFIA -- GERB party, which ruled Bulgaria from July 2009 to March 2013, would not be able to form government after the early parliamentary elections on Sunday, a leading Bulgarian political observer told Xinhua on Thursday.

Kolyo Kolev, director of the Mediana Polling Agency, said that according to its just-completed survey 32 percent of voters would support GERB party, and 31.5 percent would back the Bulgarian Socialist Party (BSP).

The other parties that would overcome the four-percent barrier to enter the 240-seat parliament would be the ethnic Turkish party DPS by 11.6 percent, the nationalist Ataka party with 8 percent, and the party of former commissioner Meglena Kuneva "Bulgaria for the Citizens" with 4 percent, Kolev said.

"GERB seems slightly dominant force, but it could hardly hope that any political party would like to play with it at that moment after all the scandals that erupted in relation to its reign," Kolev said.

"Currently GERB for everyone else is a dirty word," Kolev said.

GERB is sitting on this percentage because of the dispersion of votes of the people and formations that are against it, Kolev said.

However, with these results, GERB and BSP would take from 35 percent to 40 percent of the parliament seats in accordance with the Bulgarian electoral system.

"This parity between the two main opposing political forces GERB and BSP portend serious problems in forming a working majority and government, and the possibility of new early elections is not excluded," Kolev said.

BSP leader Sergey Stanishev has proposed the formation of broad expert government without GERB, but to make it possible, each party will have to sacrifice part of its face, purposes and views, Kolev said.

"This is a matter of moral evaluation of the previous government; what happened in the last four years," Kolev said.

The task of forming a government could be alleviated if the party "Bulgaria for the Citizens" enters the parliament, and if the president gives it a mandate, instead of mandating DPS or Ataka parties, Kolev said.

He added that these elections hold many uncertainties for sociologists because the polling agencies can not count the corporate vote, vote-buying and people's fear.

"However, based on my experience, my feeling says that GERB will fall under BSP with some 150,000 votes. That is about 3 percent to 4 percent," Kolev said.