A Mersin man, identified as E.A., was detained while he was visiting his relative, also E.A., who has been under arrest over links to the Gülen movement in Tarsus prison, on Wednesday.
According to state-run Anadolu Agency, an arrest warrant had been earlier issued against the visitor E.A. on accusation of membership to the movement.
E.A. was rounded up by gendarmerie and later put in pre-trial arrest by the court in charge.
The government has already detained more than 120,000 people and arrested some 55,000 over links to the movement so far.
The Gülen movement denies involvement in the failed coup.