Speaking on condition of anonymity due to restrictions on talking to the media, the source said Ali Yazici was detained as part of an investigation into the coup attempt by the Fetullah Terrorist Organization (FETO).
The investigation was launched by Ankara prosecutor's office.
Turkish government accuses FETO - led by followers of U.S.-based cleric Fetullah Gulen - of orchestrating the Friday's coup attempt that martyred at least 240 people and wounded more than 1,500 others, including members of the security forces and civilians.
The movement is also accused of a long-running campaign to overthrow the state through infiltrating Turkish institutions, particularly the military, police and judiciary, thus forming a “parallel state.”
Yazici has been serving his post at the presidential complex since August 12, 2015.