Prime Minister of Bulgaria Boyko Borisov (L) is welcomed by European Commission President Jean-Claude Juncker in Brussels | Julien Warnand/EPA Bulgarian PM to discuss Georgieva replacement with Juncker Boyko Borisov said he’ll try to ‘find a solution’ with Commission president on Monday.

Bulgarian Prime Minister Boyko Borisov will speak to European Commission President Jean-Claude Juncker on Monday about how to find a replacement for Bulgarian Commissioner Kristalina Georgieva as one of the vice presidents of the EU's executive arm, in charge of budget and human resources.

Georgieva resigned on Friday, three years before the end of her term, to take a job as a CEO of the World Bank.

Commission sources said Georgieva was frustrated with the workings at the highest level of the body. She is also still reeling from a failed bid to become the United Nations secretary-general.

During a visit to Novi Pazar in northeastern Bulgaria, Borisov told reporters that he would talk to Juncker on Monday to “discuss the situation and find a solution," a Bulgarian diplomat, who had listened to his comments being broadcast on the Bulgarian National Radio, told POLITICO.

In a letter confirming Georgieva’s resignation on Friday, Juncker wrote he would give her portfolio to Gunther Oettinger, the commissioner for digital economy and society.

Georgieva’s resignation will go into effect by December 31, “depending notably on the development of the ongoing budgetary negotiations,” Juncker said.

Her vacant position, he added, “shall be filled for the remainder of her term of office by a member of Bulgarian nationality, appointed by the Council, by common accord with the president of the Commission and after consulting the European Parliament.”

According to a chief of staff at the Commission, Juncker and his team could use the opportunity to reshuffle the Commission.

On Saturday, a spokesperson of the European Parliament said the assembly would hold a hearing for Oettinger, but no date has been set yet.

The identity of Georgieva's Bulgarian replacement has not been publicly revealed.

Bulgarian media on Friday speculating on potential candidates and mentioned the country's president, Rossen Plevneliev, among top contenders. Plevneliev could be available to take up the job in Brussels since he already announced earlier this year that he would not run for a second term in next month's presidential elections.

Just hours after Georgieva's resignation, Bulgaria's Deputy Prime Minister for European Funds and Economic policies, Tomislav Donchev, said that he hopes a Bulgarian national would keep her post at the Commission, according to a broadcast by BNR, an outlet of Bulgarian National Radio.

Ryan Heath contributed reporting.