Bye-elections for Mwenezi East, Mbire and Marondera Central which became vacant after the expulsion from the Zimbabwe African National Union-Patriotic Front of Kudakwashe Bhasikiti, David Butau and Ray Kaukonde will be held on 19 September.
Nomination day was set for 20 July.
The three, said to be aligned to former Vice-President Joice Mujuru, were expelled from ZANU-PF in May but Bhasikiti went to court to challenge his expulsion. Judge Chinembiri Bhunu reserved his judgment.
Two Senate seats are also vacant following the expulsion of Dzikamai Mavhaire and Olivia Muchena from ZANU-PF.
Senate seats are filled by the party with a male candidate being replaced by another male candidate and female candidate by another female.