Rhodes-Vivour is challenging the Independent National Electoral Commission (INEC) declaration of Sanwo-Olu as the winner of the exercise over alleged widespread irregularities and voter intimidation.
He had so far presented over 20,000 documents before the tribunal.
Monday’s proceedings, Idowu Benson, who held brief for the petitioner’s lead counsel, Olumide Ayeni (SAN), told the tribunal that the witness came to the court earlier but left thereafter for medical attention.
He asked the panel to adjourn the proceeding till Tuesday.
The Independent National Electoral Commission (INEC) counsel, Eric Ogiegor; and his colleague representing the governor, Segun Ajibola, did not object to the application for an adjournment.