The focus of the panel was on regional stability, boosting trade and competitiveness, and joining the Fourth Industrial Revolution.
This panel, like the two the Croatian prime minister attended on Thursday, was held behind closed doors. Among those attending were Macedonian Prime Minister Zoran Zaev, Bosnia and Herzegovina's Prime Minister Denis Zvizdic and Serbian President Aleksandar Vucic.
After the panel, Plenkovic is scheduled to hold bilateral talks with Zvizdic, Irish Prime Minister Leo Varadkar and Swiss President Ueli Maurer.
The uncertainty surrounding the United Kingdom's departure from the European Union, trade wars, climate change and slowing global growth have dominated this year's Davos meeting, and a lot of attention has also been devoted to the latest developments in Venezuela.
UN Secretary General Antonio Guterres on Thursday called for dialogue to avoid an escalation and prevent a disaster in Venezuela, where an opposition leader has declared himself president and has been recognised by the United States, Canada and a majority of South American countries.