It added that the members made the ratification at an emergency meeting on Monday in Ibadan.
Mr Sadare said Mr Omodewu died at 61 in the United States, where he had been receiving treatment for an undisclosed illness since November 2023.
APC national chair Abdullahi Ganduje, on Tuesday in Ibadan, charged different factions within the party in Oyo to work together.
“Oyo APC is Noah’s ark of our contemporary Nigeria, and anyone who looks away from the broom party is doing himself a lot of harm than good.”
The APC had been enmeshed in crisis after its congresses and primaries, with some members defecting to other political parties.
Mr Folarin made the assertions while receiving the presidential aspirant at the Ibadan Civic Centre on Thursday in Ibadan.
“A time is coming that we shall also sign Seyi Makinde to APC,” the state party chairman said.
Mr Osinbajo, a Pentecostal preacher and professor of law, on April 11 declared his intention to succeed President Muhammadu Buhari as Nigeria’s president.
Some aggrieved members in the state are accusing “a serving senator and former governor” of falsifying the delegates’ list.
