Mr Adesina denied allegations against him saying they were attempts to tarnish his reputation
The president of the African Development Bank (AfDB) has been cleared of corruption charges after a review by an independent panel.
The US, one of the bank's biggest shareholders, insisted on a new inquiry in April after an internal review cleared Akinwumi Adesina.
Whistleblowers had accused the Nigerian of giving contracts to friends and appointing relatives at the bank.
Mr Adesina is set to be re-elected for another five-year term in August.
The 60-year-old banker, a former minister of agriculture in Nigeria, will be the sole candidate in the election.
A charismatic speaker, who is known for his elegant suits and bow ties, he has led the bank since 2015.
He had denied accusations against him, saying they were "attempts by some to tarnish" his reputation.
