South Africa's President Thabo Mbeki is due in Harare for talks with his Zimbabwean counterpart Robert Mugabe and the opposition Morgan Tsvangirai.
Mr Mbeki has been mediating between the two sides which have been holding talks in South Africa for more than a week.
Despite a news blackout imposed on the discussions, reports suggest a power-sharing deal may be close.
Mr Mugabe won a run-off in June after Mr Tsvangirai pulled out of the race alleging violence against his backers.
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Mr Mbeki is expected to return to South Africa on Sunday afternoon.
Summit threat
South Africa's media report that the power-sharing deal would see Mr Mugabe retaining the presidency and Mr Tsvangirai becoming prime minister with executive powers.
However, there has been no official comment on these reports, apart from statements from all sides that the talks have been progressing well.
Mr Mbeki is under pressure to produce a solid outcome ahead of a mid-August summit of the South African Development Community, or Sadc.
Hundreds of thousands of Zimbabweans have fled the country's worsening political and economic situation, many crossing over the borders into neighbouring states of South Africa, Zambia and Bostwana.
Botswana's foreign minister suggested on Friday that Mr Mugabe should be barred from the Sadc summit.
"The legal process of producing a government in Zimbabwe has failed [...] those who claim to represent a government in Zimbabwe [...] should be excluded from attending Sadc and African Union meetings as their participation in these meetings would be equal to giving them unqualified legitimacy," Phandu Skelemani said.
(BBC)
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