The meeting will focus on the latest developments and statements from Brussels and The Hague about fugitive Croatian general Ante Gotovina, Sanader told reporters after returning from the meeting with Mesic.
The Council will also discuss Monday's statement by EU Enlargement Commissioner Olli Rehn, that he would not recommend opening membership talks with Croatia if they were to start at the moment.
Asked if the government had tried to get in touch with Gotovina although it did not know his whereabouts, Sanader said: "The government consists of ministries. It gives instructions to the ministries to do their job and in that sense any lead, any information on any Croatian citizen is verified in minute detail by different state bodies, which write reports about it."
The prime minister said he expected an objective report from Chief Prosecutor Carla del Ponte on Croatia's cooperation with the Hague tribunal, and that he hoped she would appreciate the fact that Mesic and he had made a clear statement regarding Gotovina.
"We made a clear, unequivocal statement which no one can interpret in this way or that. I expect that it will dispel any doubts about the credibility of the state leadership, first of all the government," Sanader said.
The National Security Council met last time on December 14, 2004 to discuss the international cooperation of the Croatian security services and the Security Services Act.
The Council consists of the president of the republic and the prime minister as co-chairs, the ministers of justice, defence, the interior and foreign affairs, the member of the government in charge of national security, and the armed forces chief of staff.