But the inquiry has been criticised because prosecutors have yet to issue any indictments or detail any charges against the suspects.
Last week's detentions came hours before the governing Justice and Development party (AKP) began defending itself in court against a possible ban for violating Turkey's secular order.
The party dismisses the charges as politically motivated.
Media reports said that during Tuesday's raid, a secret plan was seized that called for illegal protests on July 7 across 40 provinces, assassinations and attacks on security forces.
Eight of the detained have been arrested, and others, including a prominent journalist with a pro-secular newspaper, have been released but barred from leaving the country.
Both generals' lawyers dismissed the allegations as false, saying they will fight the charges in court.
Turkey, a predominantly Muslim country with an officially secular government, has had four military coups against elected governments in the past 50 years. No senior generals have been arrested for political reasons during that time.