The former vice president said his decision to make the announcement in Rivers State was because he believes the Rivers State Governor Nyesom Wike represents what he represented in 1998/99 as the live wire of the PDP.
Mr Abubakar, who contested against President Muhammadu Buhari for the APC presidential ticket for the 2015 general elections, resigned from the APC in November 2017.
In his resignation letter, he accused the APC of embracing unconstitutionality and of failing to keep its promises to Nigeria.
On 3 December 2017, he announced his return to the PDP.
Following his return to the party, he participated in its national convention at which Uche Secondus was elected National Chairman of the party.
He has also held meetings with key figures in the PDP. In January, he visited Ekiti State Governor Ayo Fayose with whom he said he had a good relationship.