Morgan Tsvangirai was in Senegal for talks with President Abdoulaye Wade, who he said he had met to seek advice.
"The mediation of SADC (the Southern African Development Community) has not succeeded," Tsvangirai told reporters. "I feel it is logical that the African Union intervene and take on this issue."
Last week, Tsvangirai said "no progress" had been made in a new round of talks that started November 25. The two sides had agreed to form a unity government but ongoing talks have stalled over how to divide Cabinet posts.
Tsvangirai has already called for former South African President Thabo Mbeki to step down as mediator.
Tsvangirai won March elections in which his party ended the 28-year domination of Parliament by Mugabe’s party. But officials results said he did not win outright, and he withdrew from a runoff because of state-sponsored violence that put thousands of his supporters in the hospital and made more homeless as tens of thousands of homes were burned. – Sapa-AP