"We have not received any documented proof in this regard and we do not confirm such reports," Reza Jafarzadeh, a CAO spokesman, told ISNA on Sunday.
He added that no German government's official body had sent any report to Iran about imposing sanctions on the private Iranian airline, Mahan Air, while no German authority had made any comment in this regard either.
German newspaper Bild on Friday reported that the country's government had taken the decision to stop Mahan Air from operating its flights to the cities of Dusseldorf and Munich after intensive deliberations on US demands.
Mahan Air is under US sanctions over allegations that it ferries troops and supplies into Syria.
Back in May, the United States imposed new sanctions against nine Iranian and Turkish individuals and companies as well as a number of entities providing goods and services to four Iranian airlines.
The US imposes new sanctions against a number of Iranian and Turkish entities cooperating with four Iranian airlines.
The sanctions announced by the US Treasury Department, targeted the entities cooperating with Iran's Mahan Air, Caspian Air, Meraj Air, and Pouya Air.
The Treasury Department claimed in a statement that the banned entities extended a lifeline to the Quds Force of the Islamic Revolution Guards Corps (IRGC).