Writing on micro-blogging website Twitter, Mawarire said the nine soldiers who guarded Mugabe's Blue Roof residence in Borrowdale were removed. "I can't. I will choose among the 22 [other candidates]", Mugabe said.
Like earlier stated, ruling ZANU PF maintains President Mnangagwa as a man to reckon on in tomorrow's polls. But I am not selecting any votes.
The latest polls suggest that a run-off between the main opposition leader Chamisa and Zanu PF's Emmerson Mnangagwa is a serious possibility.
"I must say clearly, I can't vote for people who have tormented me. The more the merrier", Chamisa said in response to a question about Mugabe's endorsement.
Speaking from his home in the capital, Harare, on Sunday, the former president again said he had been "sacked" as part of a military coup and that he left office in order to "avoid conflict".
He also could endorse someone ahead of Monday's election in which his former deputy, President Emmerson Mnangagawa, faces a 40-year-old lawyer and pastor, Nelson Chamisa. "Definitely not. I wish to meet him if he wins", he told reporters.
Mnangagwa, 75, who promises a fresh start for the country, is the front-runner with the advantage of covert military support, a loyal state media and a ruling party that controls government resources.
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But Chamisa, 40, who has performed strongly on the campaign trail, hopes to tap into a young population that could vote for change.
He made the comments after Mugabe said he would vote for the opposition in Monday's election.
Campaigning has been relatively unrestricted and peaceful compared with previous elections, and some analysts point to pressure for the vote to be judged credible to draw a line under the global isolation of the Mugabe era.
The survey indicated that 20% of the people who responded to the survey were undecided.
Both Chamisa and Mnangagwa have vowed to rebuild an economy shattered by Robert Mugabe's long rule.
They will be voting in presidential, parliamentary and local elections.
If Chamisa disputes the result or no one candidate gets more than 50 per cent and there is a runoff, there are fears of street protests and possible violence.