The state-run Anadolu Agency said the seven people are suspected of aiding Ghosn. NTV television said the probe was launched by launched by Turkey's Interior Ministry.
The private DHA news agency reports that those detained are 4 pilots, a cargo company manager and two airport workers.
Lebanon has said that Ghosn entered the country legally and there was no reason to take action against him.
Japan does not have an extradition treaty with Lebanon.
Ghosn, who was charged with under-reporting his future compensation and a breach of trust, has repeatedly asserted his innocence. He says Japanese authorities trumped up the charges to prevent a possible fuller merger between Nissan Motor Co. and alliance partner Renault SA. Before his arrest, Ghosn was chairman of both Nissan and Renault.
His 1.5 billion yen ($14 million) bail that Ghosn posted on two separate instances to get out of detention is being revoked.