Gov. Rauf Aregbesola of Osun announced the return while briefing journalists after a closed door meeting of leaders of the APC at the residence of Osoba in Ikoyi, Lagos.
``A time was when Osoba switched to another party, he was a foundation member of the APC and he was in the APC throughout my election.
``Yes, he was for a time with the SDP, but with what we have just done today, Akinrogun Osoba, the Aremo himself is back with the progressive leadership of the Yoruba race," Aregbesola said.
``As such we are happy to tell the world that the leadership of progressive politics in the Western part of Nigeria is united.
``We are ready to jointly prosecute the agenda for growth, purposeful leadership, development, good governance in the Western part of Nigeria.
``The progressive leadership of the Yoruba race is now fully united and are ready and charged to lead our efforts to reposition our land and integrate with others nationwide to put Nigeria in its proper footing," he said.
Also speaking, the national leader of the APC, Chief Bola Tinubu said it was very crucial for the party to strengthen its front.
``I am an unapologetic progressive and I will remain one and that is the only principle I abide with.
``Wherever the progressives are, they must be united with their vision. Nobody is left out, it is all progressives and no one is left out, no matter your insinuation," Tinubu said.
The News Agency of Nigeria (NAN) reports that Chief Niyi Adebayo, Chief Bisi Akande, Lagos State Deputy Governor, Dr Idiat Adebule and a former Deputy Governor of Ogun State, Mr Olusegun Adesegun, among others attended the meeting.