At the same time, it said it would ‘authorise’ an independent review of the report in the interest of due process and in deference to the demands of some board members.
AfDB President Adesina was accused of abuse of office by a whistleblower at the bank.
The allegations include favouritism in hiring some personnel.
He has denied the allegations and a report by the bank’s ethics board cleared him of wrongdoing.
The United States, AfDB’s second-largest shareholder, has demanded a new independent probe into the allegations, rejecting the bank’s investigation over reservations about the integrity of the bank’s process.
Meanwhile, top shareholder Nigeria has voiced its support for Adesina.
In a statement, AfDB’s board of governors chair, Ms. Niale Kaba said the board believed the bank’s ethics committee, which produced the report, had carried out its role correctly.
The statement also said the board chair also performed its role correctly in accepting the report of the committee.
But the board has nevertheless agreed to authorise a review, to ‘carry all the governors along’.
“The independent review shall be conducted by a neutral high caliber individual with unquestionable experience, high international reputation and integrity,” the statement by Kaba said.
The board expects the review to be done between two to four weeks.
On Tuesday, Nigerian President Muhammadu Buhari gave his backing to Adesina in his bid for a second term as AfDB president despite the allegations.
Adesina later this year plans to pursue a second term as the head of the multilateral lender, which is headquartered in Ivory Coast’s commercial capital Abidjan.
The board said the review of the investigation would take no more than four weeks and not interfere with the bank’s electoral calendar.
The bank’s whistle-blowing and complaints handling policy will also be reviewed at a later date to ensure it is being properly implemented, it said.
NAN