Gurcan Balik served as executive assistant to former Prime Minister Ahmet Davutoglu as well as foreign policy advisor to former President Abdullah Gul from August 2013 to July 2014, Xinhua news agency reported.
Ali Findik and Tuncay Babali are former ambassadors to Costa Rica and Canada, respectively, who had been removed from their posts due to links with the Fethullah Terrorist Organisation (FETO), which Turkey accuses, along with its leader, US-based cleric Fethullah Gulen, of masterminding the July 15 coup attempt.
The three suspects were sent to jail, pending trial after their testimonies in an Ankara court.
Meanwhile, four municipal mayors from the Justice and Development Party (AKP) were discharged from the party on Friday due to their ties with the Gulenists, as part of the investigation following the coup attempt.
