"The objective of creating this group is to give teeth to the plan, to convince the parties to implement the plan in its entirety. It is not to create a new plan," Fawzi told a regular U.N. media briefing.
The contact group meeting has been in doubt because of U.S. opposition to Iran's involvement.
Iran, along with Russia and China, which both blocked early U.N. Security Council efforts to put pressure on Syria, backs Syria's government, despite U.N. human rights investigators accusing it of committing crimes against humanity.
Although the list of participants and the venue for the meeting have yet to be agreed, Annan was hopeful, Fawzi said.
"He is encouraged by signs that member states are taking it very seriously, in fact we have heard that the Russians are calling on (U.N.) member states with influence to get together," he said. "It is coming together. Diplomacy has intensifed."