He added that he hoped a Darfur settlement would "reflect positively on Sudan's unity, security and sovereignty."
Libyan leader Moamer Kadhafi announced Wednesday that Tripoli would host the mini-summit on Darfur.
Bringing together the leaders of Chad, Egypt, Nigeria, Gabon and Sudan as well as Libya and the African Union, but not the rebels, the gathering had initially been due to be held in Egypt's Red Sea resort of Sharm el-Sheikh.
Kadhafi has invited Darfur's two main ethnic minority rebel groups -- the Sudan Liberation Movement and the Justice and Equality Movement -- to participate in the talks.
The rebels have accused the Arab-dominated regime in Khartoum of pursuing a "war of extermination" against Darfur's indigenous minorities since they launched their uprising two years ago.
As many as 300,000 people have died in the conflict and more than two million more fled their homes, according to a British parliamentary committee report.
Zaki said Mussa will leave Cairo for Tripoli Sunday to attend the summit.