The endorsement of Jokowi, who commands approval ratings of 80%, will have direct bearing on who wins February's election.
Days later Golkar and PAN announced support for Prabowo, giving him the largest party support base.
Jokowi has also lent support to Ganjar, deploying teams and volunteer groups to work on his campaign, four sources said.
Jokowi has also engaged in talks about vice presidential picks for both Ganjar and Prabowo, three sources said.
"Ganjar and Prabowo are 'Jokowi's men' but who knows after Jokowi steps down," he said.
Persons:
Indonesia's, Joko, Subianto, Sana Jaffrey, Jokowi, Ganjar, Prabowo, Megawati Sukarnoputri, kingmaker, nepotistic autocrat, Suharto, It's, ANU's Jaffrey, Gibran Rakabuming Raka, Jokowi's, Kaesang Pangarep, Bobby Nasution, Yoes, Kate Lamb, Ananda Teresia, Kanupriya Kapoor, William Mallard
Organizations:
Australia's National University, Democratic Party of Struggle, Prabowo, Golkar, National Mandate Party, PAN, PDI, Constitutional, Indonesian Solidarity Party, Atma Jaya University, Thomson
Locations:
JAKARTA, Jakarta, Jokowi, Surakarta, Medan, Indonesia's