Former British soldier , who was jailed in Equatorial Guinea for his part in a coup plot, is expected to arrive back in the UK on Wednesday.
Mann, 57, had been sentenced to 34 years in prison, but he was pardoned on Tuesday along with four South Africans.
He is now thought to be with his sister and brother in the capital, Malabo, awaiting a flight back to Britain.
Mann admitted conspiring to oust Equatorial Guinea's president, but said he was only "a pawn" in the plot.
In March 2004, police in Zimbabwe impounded a plane from South Africa. They arrested Mann and 63 others on board amid suspicions they were mercenaries plotting to overthrow President Teodoro Obiang Nguema.
The Briton served four years in a Zimbabwean jail before being extradited to Equatorial Guinea where he was tried and convicted.
He was sentenced to 34 years despite pleas from Mann's lawyer that he had been "not a co-author" of the coup plot but "an accomplice".
'Profoundly grateful'
On Tuesday, an adviser to President Obiang, Miguel Mifuno, said that Mann had been released on humanitarian grounds related to his health - he had a hernia operation in 2008.
Mr Mifuno said: " conducted himself in exemplary fashion during his trial and his incarceration in Equatorial Guinea.
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