He said the 15-nation Southern African Development Community (SADC) "remains seized with the enormous responsibility" of making sure that the two sides in the February accord, which ended a prolonged political standoff, "move rapidly towards its full implementation".
Tsvangirai, speaking at a press conference on the sidelines of a SADC summit in Kinshasa, added that he was attending the event as leader of the former opposition Movement for Democratic Change (MDC) party.
"Now that the SADC Troika is specifically vested with the matter of Zimbabwe it is my hope and belief that it will deal with all outstanding issues as a matter of urgency," he said.
Tsvangirai's MDC and Mugabe's ZANU-PF signed a deal to form a unity government after months of political violence but they have clashed over the appointment of a central bank chief and chief prosecutor.
South Africa's President Jacob Zuma was to report to the summit on his latest meetings with Mugabe and Tsvangirai aiming to resolve the remaining tensions between the political rivals.
The summit also discussed the crisis in Madgascar, which was suspended from the SADC after Andry Rajoelina ousted President Marc Ravalomanana in March.
Madasgascar's main opposition movements have rejected a proposal by the island's contested leader for a "consensus government".
Internationally-brokered crisis talks last month yielded a deal stipulating that the president and prime minister of a power-sharing transition administration were to be decided by consensus.
But Rajoelina has refused to change the prime minister he appointed after his army-backed takeover. The three opposition groups, led by former heads of state, have insisted they will not give a vote of confidence to a cabinet drawn up by Rajoelina's camp.
The SADC summit in the Democratic Republic of Congo capital was also to discuss climate change policy ahead of international talks in Copenhagen in December and free trade measures.
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Godsson
Solidstonez
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